Table of Contents

Stephan Berko 1924-1991A.T. Stewart 3

In Memoriam Kumo FujiwaraT. Hyodo 9

Spins, Symmetries and Anti-Matter: Contributions of Arthur Rich to Atomic PhysicsA.P. Mills 13

In Memoriam Bronislaw RozenfeldE. Debowska 21

Ab-Initio Calculations of Vacancy Formation and Vacancy-Solute Interaction Energies inMetalsP.H. Dederichs, B. Drittler, U. Klemradt and R. Zeller 31

Positron-Emission-Tomography: A New Technique for Analyzing Biochemical Reactions inthe Living Human BodyL.E. Feinendegen, H. Herzog and T. Kuwert 51

Antiprotons, Positrons and AntihydrogenG. Gabrielse, W. Jhe, D. Phillips, R. Kaiser, H. Kalinowsky and J. Gröbner 75

AnnihilationI. Lovas 85

Progress in Fundamental Positron Physics at Low EnergiesA.P. Mills 101

Fermi Surface and its Implications in the High Temperature Superconductor YBa2Cu3O7W.E. Pickett and D.J. Singh 125

Small and Fast: Some Contemporary Aspects of Radiation ChemistryR. Schiller 133

Current Problems of Defects in Semiconductors – Interaction of Defects with ImpuritiesK. Sumino 139

The Miracle of SuperconductivityE. Teller 161

Theoretical Electron-Positron Momentum Density and 2D-ACAR Positron Experiments inYBa2Cu3O7A. Bansil and L.C. Smedskjaer 171

Enhancement Factors in MetalsE. Boronski 181

Defects in Reactor Steels – A Challenge to Positron Annihilation and Other MethodsG.H. Bauer 189

Spin States of Positron CompoundsR.S. Brusa and A. Dupasquier 197

ACAR Study in Metal OxidesT. Chiba 205

Experiments on Positron ImplantationP.G. Coleman, J.A. Baker and N.B. Chilton 213

Vacancies and Negative Ions in GaAsC. Corbel 221

Positron Studies of Gases and Gas Bubbles in MetalsM.M. Eldrup 229

The Electron-Positron Momentum Density and Fermi Surface of YBa2Cu3O7-xH. Haghighi, J.H. Kaiser, S. Rayner, R.N. West, R. Shelton, R.H. Howell, F. Solal, P.A. Sterneand M.J. Fluss 249

Positronium in Zeolitic Materials – SepioliteM. Hasegawa, Y. Tsuchiya, Y. Kitayama, T. Chiba, M. Saitoh and S. Yamaguchi 257

Electronic Structure in High Temperature Superconducting OxidesR.H. Howell, P.A. Sterne, F. Solal, M.J. Fluss, J. Tobin, J. O'Brien, H.B. Radousky, H. Haghighi,J.H. Kaiser, S.L. Rayner, R.N. West, J.Z. Liu, R. Shelton, C.G. Olsen, C. Gu, K. Kitazawa and H.Kojima 265

Mass Spectrometry Studies of the Ionization of Large Organic Molecules by Slow PositronsL.D. Hulett, D.L. Donohue, G.L. Glish, S.A. McLuckey and T.A. Lewis 273

ACAR Study of Positronium-Gas Molecule InteractionsT. Hyodo 281

Positron and Positronium Localization in Liquids and GasesI.T. Iakubov and A.G. Khrapak 289

Theory of Ion Desorption due to Positronium Formation at Solid SurfaceA. Ishii and Y. Murata 297

Depth Profiling of Defects in Low Temperature MBE-Grown SiliconT.E. Jackman, G.C. Aers, J.P. McCaffrey, D.T. Britton, P. Willutzki, P.J. Simpson, P.J. Schultzand P. Mascher 301

Free-Volume Properties of Polymers Probed by Positron Annihilation SpectroscopyY.C. Jean 309

Positron Transport and Surface InteractionsK.O. Jensen and A.B. Walker 317

Momentum Density Reconstruction from 2D ACAR DataG. Kontrym-Sznajd 325

Vacancies in II-VI- and IV-VI Compound Semiconductors Studied by Positron LifetimeSpectroscopyR. Krause, M. Neubert, T. Drost, W. Hörstel, A. Polity, F.M. Kiessling, U. Paitz, V.P. Zlomanovand S. Mäkinen 333

Positron Annihilation at Clean Metallic SurfacesG. Kögel 341

New Results in Atomic Physics with PositronsG. Laricchia and M. Charlton 349

Slow Positron Studies of Hydrogen Interaction with SiO2/Si(100) InterfacesK.G. Lynn and P. Asoka-Kumar 359

Positron Mobility and Trapping in SemiconductorsJ. Mäkinen 369

The Electronic Structure of the Heavy-Fermion System URu2Si2P.E. Mijnarends, G.J. Rozing, D.D. Koelling and A.A. Menovsky 377

Path Integral Formulation of Positron and Positronium Lifetimes in FluidsB.N. Miller and G. Worrell 385

"Squeezed" Positronium in Condensed MatterO.E. Mogensen 393

Measurement of the Decay Rate and 2-Gamma Branching Ratio of OrthopositroniumJ.S. Nico, D.W. Gidley, M. Skalsey and P.W. Zitzewitz 401

Positron Annihilation in YBaCuOM. Peter, T. Jarlborg, B. Barbiellini, A.A. Manuel, L. Hoffmann, A. Shukla, E. Walker, P. Lerchand W. Sadowski 411

Theory of Positron Annihilation and Trapping in SemiconductorsM.J. Puska 419

Latest Results in Compton-Profile StudiesN. Sakai 431

Thermal Formation of Vacancies in Intermetallic CompoundsH.E. Schaefer, R. Würschum and J. Bub 439

Positronium Localization in Spontaneous Density Fluctuations in Molecular GasesS.C. Sharma 451

A Two-Dimensional ACAR Study of Untwinned YBa2Cu3O7-xL.C. Smedskjaer and A. Bansil 459

Positron Lifetimes in Solids from First Principles CalculationsP.A. Sterne, J.H. Kaiser, J.C. O'Brien and R.H. Howell 469

Temperature Dependence of Positron Annihilation Parameters in High TemperatureSuperconductorsC.S. Sundar, A. Bharathi, Y.C. Jean, W.Y. Ching, X. Lu, S.J. Wang, F. Zandienadem, Y.Y. Xue,P.H. Hor, R.L. Meng, Z.J. Huang and C.W. Chu 477

On the Electron-Momentum Distribution in the Superconducting StateM.B. Suvasini, B.L. Györffy and W.M. Temmerman 485

b Positron Annihilation - ICPA-9

Electronic Structure in Semiconductors Studied by Two Dimensional Angular Correlationof Positron Annihilation RadiationsS. Tanigawa 493

The Electron Momentum Distribution of LiMg Alloys by Positron-Annihilation 2D-ACARW. Triftshäuser, A. Eckert, G. Kögel and P. Sperr 501

Positron Annihilation Induced Auger Electron SpectroscopyA. Weiß 511

Determination of the Gamma-Ray Energy of Parapositronium in Two Gamma DecayT.B. Chang, H.D. Wang, Z.Q. Shen and S.Y. Wang 521

Absolute Differential Cross Sections for the Impact Ionization of Helium by 55 eV PositronsR.L. Chaplin, L.M. Diana and D.L. Brooks 525

Search for Resonant States in Positron Electron ScatteringT.E. Cowan, J. Hartley, R.H. Howell, J.L. McDonald, R.R. Rohatgi and J. Fajans 529

Evidence for CW 1S-2S Excitation of PositroniumM.S. Fee, A.P. Mills, E.D. Shaw, S. Chu, K. Danzmann, R.J. Chichester and D.M. Zuckerman 533

Preliminary Results on Impact Ionization of Molecular Hydrogen by Electrons andPositronsN.P. Frandsen, F.M. Jakobsen, H. Knudsen and U. Mikkelsen 539

Investigation of Excited State PositroniumD. Hagena, R. Ley, K.D. Niebling, G. Werth, C. Hahn, H. Schneider and I. Tobehn 545

Multi-Photon Optical Excitation of PositroniumR.H. Howell, K.P. Ziock, F. Magnotta, C.D. Dermer, R.A. Failor and K.M. Jones 549

Elastic Scattering of Positrons by Helium and Neon AtomsA.H. Houssa, H.H. Eissa and S.A. Elkilany 553

L-Shell Ionization by Positron and Electron ImpactH. Schneider, I. Tobehn and R. Hippler 559

Efficient Formation of n=2 PositroniumT.D. Steiger and R.S. Conti 565

Positron Annihilation in Ferroelectric CrystalsJ.C. Abbé, G. Duplâtre and J. Serna 571

Identification of ACAP Components in Thallium Series High-Tc SuperconductorsV.T. Adonkin, V.V. Dyakin, V.S. Yefanov, M.A. Tanatar, A.I. Akimov and A.P. Chernyakova 575

Formal Valency of Cu(1) in YBa2Cu3O7-x and Electron Momentum Distributions: 1D-ADAP DataN.Y. Arutyunov 579

Results of Systematic Study of Annihilation Photons 1D-Angular Distributions in Diamond-Like SemiconductorsN.Y. Arutyunov 583

The Influence to 1D-ADAP Parameters in Re-Ba2Cu3O7-x Oxides by Variations of Re-Elements, Oxygen Content and TemperatureN.Y. Arutyunov and V.Y. Trashchakov 587

Positron Mobility in Gallium ArsenideH.L. Au, C.C. Ling, T.C. Lee, C.D. Beling and S. Fung 591

Positron Lifetime in C60/C70 PowderT. Azuma, H. Saito, Y. Yamazaki, K. Komaki, Y. Nagashima, H. Watanabe, T. Hyodo, H.Kataura and N. Kobayashi 595

Effects of Enhancement for Positron Annihilation in High-Tc OxidesB. Barbiellini, P. Genoud, P. Lerch, T. Jarlborg and M. Peter 599

Temperature Dependence of the Positron Diffusivity in Cubic CrystalsR. Blank, A. Seeger and L. Schimmele 603

Calculation of Positron-Electron Enhancement Factors for Real Metals on a Base of BandStructure DataE. Boronski and T. Jarlborg 607

Positron Affinities for CarbidesG. Brauer, M. Šob and M.J. Puska 611

Study of Three Dimensional Electron-Positron Momentum Density in GaSbY.K. Cho, H. Kondo, T. Kubota, H. Nakashima, T. Kawano and S. Tanigawa 615

Materials Science Forum Vols. 105-110 c

Study of Three Dimensional Electron-Positron Momentum Density in InPY.K. Cho, H. Kondo, T. Kubota, H. Nakashima, T. Kawano and S. Tanigawa 619

Positron Annihilation in Fe-Co AlloysJ. Chojcan 623

Positron Annihilation with Rare-Gas Core Electrons: Momentum Dependence ofEnhancement FactorS. Daniuk, G. Kontrym-Sznajd, M. Šob, J. Majsnerowski and H. Stachowiak 627

High Sensitivity of Rare-Gas Core Positron Annihilation Characteristics in Metals to theLattice Dimensions and to the Parameters of Electron and Positron ModelsS. Daniuk, M. Šob and A. Rubaszek 631

Electronic Structure of Pd-Ag(Au) Alloys Investigated by Positron AnnihilationE. Debowska 635

Spin-Polarized 2D ACAR in Nickel Across the Curie TemperatureP. Genoud, A.A. Manuel, E. Walker and M. Peter 639

Positron Lifetimes in MetalsT. Górecki 643

Fermi Surface Study of YBa2Cu3O7 by 2D-ACARL. Hoffmann, W. Sadowski and M. Peter 647

Structural Features in Icosahedral Al63 Cu25 Fe12R.H. Howell, C. Berger, F. Solal, Y. Calvayrac and P.E.A. Turchi 651

Positron Annihilation Studies of Barium Titanate CeramicsF.H. Hsu and T.K. Hou 655

A Doppler Broadening Study of Dilute Ni-Transition Metal AlloysD.M. Hunter and R.I. Grynszpan 659

Positron Annihilation Studies on the Heavy Electron Compounds of LaSb and CeSbF. Itoh, H. Sakurai, T. Suzuki, Y.S. Kwon, Y. Kubo and K. Suzuki 663

On the Tl Valent States in Ga-Tl-Te System on the Basis of Positron Annihilation DataI.B. Kevdina, V.P. Shantarovich and V.S. Minaev 667

Age-Momentum Correlation in Electron-Positron Annihilation of Natural DiamondM. Koch, K. Maier, J. Major, A. Seeger, J.P.F. Sellschop, E. Sideras-Haddad, H. Stoll and S.H.Connell 671

Positron Study of Momentum Density and Fermi Surface in CuH. Kondo, T. Kubota, H. Nakashima and S. Tanigawa 675

Study of Spin Dependent Positron-Electron Momentum Density in Ferromagnetic Co byTwo Dimensional Angular Correlation of Positron Annihilation RadiationsH. Kondo, T. Kubota, H. Nakashima and S. Tanigawa 679

Electronic Structure in Nd2-xCexCuO4 and Pr2-xCexCuO4 Studied by Two DimensionalAngular Correlation of Positron Annihilation RadiationsH. Kondo, T. Kubota, H. Nakashima, S. Tanigawa and Y. Hidaka 683

Electronic Structure in Bi2Sr2CaCu2O8 Studied by Two Dimensional Angular Correlationof Positron Annihilation RadiationsH. Kondo, T. Kubota, N. Nakashima, S. Tanigawa, F. Minami and S. Takekawa 687

Influence of the Local Density Function on the Momentum Dependence of the ElectronDensityG. Kontrym-Sznajd 691

The Effective Electron Density Parameter for MetalsG. Kontrym-Sznajd and S. Daniuk 695

Positron Annihilation in Zn and CdG. Kontrym-Sznajd and J. Majsnerowski 699

Are there a Charge-Density Wave or a Spin-Density Wave in the Cu-0 Chain in Y-Ba-Cu-0Superconductors?J. Krištiak, O. Sausa, K. Kristiaková and R. Hlubina 703

Angular Distribution of Positron Annihilation Radiation in RSb(R=La, Ce and U)Y. Kubo and S. Asano 707

Positron Annihilation Study in La2CuO4Y. Kubo and S. Asano 711

Positron-Annihilation Studies of the Electronic Structures of RB6(R=La, Ce, Pr and Nd)Y. Kubo and S. Asano 715

d Positron Annihilation - ICPA-9

Three Dimensional Electron-Positron Momentum Density in Both Paramagnetic andAntiferromagnetic CrT. Kubota, H. Nakashima, H. Kondo and S. Tanigawa 719

Three Dimensional Electron-Positron Momentum Density in V, Nb and TaT. Kubota, H. Nakashima, H. Kondo, S. Tanigawa, Y. Murakami, Y.K. Cho and G.W. Bahng 723

Three Dimensional Electron-Positron Momentum Density in Paramagnetic Cr, Mo and WT. Kubota, H. Nakashima, Y. Murakami, H. Kondo and S. Tanigawa 727

Infiuence of Static and Alternating Fields on Positron Lifetimes in Silicon and GermaniumN.M. Kulkarni and A.D. Shaligram 731

Temperature Dependence of Positron Lifetime in Single Phase Bi-Sr-Ca-Cu-0SuperconductorX.H. Li, H. Liu, S.J. Wang, J.J. Du, H.T. Ren, L.T. Xiao and Q. He 735

Positron Lifetime in Synthetic DiamondY.S. Li, S. Berko and A.P. Mills 739

Electron-Positron Momentum Density in Ge and DiamondW. Liu, S. Berko and A.P. Mills 743

Angular Correlation Distribution and Electron Momentum Distribution of GraphiteL. Yongming, B. Johansson and R.M. Nieminen 747

Application of the Positron-Electron Product Formalism for Al and SiL. Yongming, B. Johansson and R.M. Nieminen 751

Systematic Positron Studies of High Temperature Superconductivity: Neutron-IrradiatedYBa2Cu3O7X. Lu, S.J. Wang, C.S. Sundar, A. Bahrathi, Y.Y. Lyu, W.Y. Ching, Y.C. Jean, P.H. Hor, Y.Y.Xue, J.Z. Huang and C.W. Chu 755

Positron-Annihilation 2D-ACAR Measurements in the High-Tc SuperconductorBi2Sr2CaCu2O8+xA.F.J. Melis, A.W. Weeber and P.E. Mijnarends 759

Positron Mobility in Natural DiamondA.P. Mills, G.R. Brandes, D.M. Zuckerman, W. Liu and S. Berko 763

Positron Angular Correlation Studies of YBa2Cu3O6+x and YBa2Cu408 SuperconductorsT. Nagarajan, S. Sivasankaran, D. Ravichandran and K. Nandhini 767

Positron Study of Fermi Surface and Electron Momentum Density in MgH. Nakashima, T. Kubota, H. Kondo and S. Tanigawa 771

Three Dimensional Electron-Positron Momentum Density in 2H-NbSe2H. Nakashima, T. Kubota, H. Kondo, S. Tanigawa, I. Umehara, T. Ebihara, N. Nagai, Y. Onukiand K. Takita 775

Positron Study of Fermi Surface and Electron Momentum Density in AlH. Nakashima, T. Kubota, Y. Murakami, H. Kondo and S. Tanigawa 779

Positron Study of Electron Momentum Density and Fermi Surface in β'-AgZnH. Nakashima, T. Kubota, Y. Murakami, H. Kondo, S. Tanigawa, K. Ohshima and Y. Matsuo 783

Positron States in GaAs: First-Principles Molecular Dynamics StudiesR.M. Nieminen, M.J. Puska, K. Laasonen and M. Alatalo 787

Application of the LCAO Method to the Calculation of Positron Wavefunctions in AlkaliMetalsW. Obermayr 795

Positron Polarisation in Semiconductors from LDAH. Rojas, B. Barbiellini and T. Jarlborg 799

Electron Momentum Distributions in Sodium and LithiumY. Sakurai, S. Nanao, Y. Nagashima, T. Hyodo, T. Iwazumi, H. Kawata, M. Ito, N. Shiotani andA.T. Stewart 803

Positron Annihilation in Organic Single-CrystalsM. Sano and H. Murakami 807

Field Dependence of Positron Mobility in SemiconductorsM. Sayed, K.O. Jensen and A.B. Walker 811

Positron Lifetime and Annihilation Site in C60/C70 FulleritesH.E. Schaefer, M. Forster, R. Würschum, W. Krätschmer, K. Fostiropoulos and D.R. Huffman 815

Materials Science Forum Vols. 105-110 e

The Determination of Positron Diffusivities from Lifetime Measurements on Fine-GrainedPolycrystalsA. Seeger 821

Self-Trapping and Anisotropic Positron Diffusion in the Hexagonal Close-Packed Metals Znand CdA. Seeger and F. Banhart 825

Positron Annhilation in Icosahedral Phase and Crystal Phase of AlLiCu AlloysD. Shi, L.Y. Xiong and W. Deng 829

Electron Momentum Distribution in VanadiumN. Shiotani, Y. Tanaka, M. Ito, N. Sakai, Y. Sakurai, H. Sakurai, F. Itoh, T. Iwazumi, H. Kawataand M. Ando 833

High Temperature Positron Diffusion in Si, Ge and GaAsE. Soininen, D. Beyer, P.J. Hautojärvi, J. Mäkinen and S. Palko 837

The Influence of Crystal Potential and Positron Wave Function Anisotropy on theMomentum Density of Electron-Positron PairsH. Sormann and M. Šob 841

The Role of Electron and Positron Scattering States within the Bloch-Modified LadderExpansionH. Sormann and D. Wallner 845

Electron-Positron Interaction in Jellium: Liquid Theory ApproachH. Stachowiak 849

Electron-Positron Interaction in an Electron Gas at Low and High DensitiesH. Stachowiak and J. Lach 853

Systematics of Two-Photon Momentum Distributions in 3d Transition MetalsV. Sundararajan, D.G. Kanhere and R.M. Singru 857

Positron Annihilation Rates in Simple and Transition Metals by Local Density Approach -Comparison of Recent ResultsM. Šob, S. Daniuk and A. Rubaszek 861

Positron Annihilation Study of Spin-Crossover in [Fe(ptz)6](BF4)2 Single CrystalsA. Vértes, K. Süvegh and P. Gütlich 865

Measurement of Positron Mobility in GaAs by Lifetime TechniqueW. Yu and B. Cao 869

Positron Annihilation Study on Age-Hardened Al AlloysS. Abis, P. Bartolomei, M. Biasini, A. Dupasquier, A. Somoza and M. Valli 875

PAS of YBa2Cu3O7 γ-Irradiated CompoundsV.T. Adonkin, V.V. Dyakin, B.M. Gorelov, P.O. Gorbic, V.M. Ogenko, V.S. Melnikov, N.P.Pshentsova, I.B. Kevdina and V.P. Shantarovich 879

The Specific Capture Rate of Positrons at Dislocation in CopperA. Andreeff, G.H. Bauer and C. Doering 885

Investigation of the Electron and Atomic Structures in Metallic Glasses Fe78-xCoxSi9B13before and after Crystallization by Means of Positron Lifetime and X-Ray MethodsG. Antosik and J. Filipecki 889

Effects of Lattice Imperfections and Phase Transformations on Tc Value in YBa2Cu3OyHTS. PA and TSL StudiesL.G. Aravin, A.V. Bobolev, M.K. Filimonov, V.V. Gustov, A.I. Ryzhkov, V.P. Shantarovich,S.N. Vydrin and A.R. Zainullin 893

Positron Annihilation and Mössbauer Spectroscopy of B2 AlloysA.G. Balogh, I. Dézsi, J. Pelloth, R.A. Brand, W. Puff and W. Keune 897

Positron Annihilation Studies of Neutron-Irradiated CrMoV-Type Pressure Vessel SteelF. Bečvář, Y. Jirásková, E. Keilová, J. Kocík, L. Lešták, I. Procházka, B. Sedlák and M. Šob 901

Positron Annihilation Characteristics at Small Solute Clusters in Al-MatrixA. Bharathi and C.S. Sundar 905

A Doppler Broadening Steel Annealing StudyM. Borrell, R.I. Grynszpan and N. Ji 909

A Study of Structural Defects in Sputtered ZrN FilmsJ. Brunner, A.J. Perry, J.P. Schaffer and W.D. Sproul 913

Investigation of Hydrogen Induced Defects in Iron by PAT and HREMB. Cao, H. Ichinose, W. Yu, Y. He, H. Li and Y. Ishida 917

f Positron Annihilation - ICPA-9

Point Defects in Neutron Transmutation Doped CZ SiliconM. Chardalas, S. Dedoussis, A.K. Liolios, C.A. Elftheriadis, S. Charalambous and X.T. Meng 921

The Effect of Point Defects Introduced by Proton Irradiation on Positron Annihilation in SiY.K. Cho, H. Kondo, T. Kubota, H. Nakashima, T. Kawano, A. Uedono, T. Kurihara and S.Tanigawa 925

Vaeancy Type Defects after Post-Growth Quenching and Re-Annealing of Si GaAsJ.M. Clayton, H.M. Fretwell, S.G. Usmar, A. Alam and D.T.J. Hurle 929

The EL2 Defect and Vacancy in GaAsC. Corbel, P.J. Hautojärvi, C. LeBerre, L. Liszkay and K. Saarinen 933

Positron Lifetime Study in Quenched and Irradiated Pb and Concentrated Pb(Ag) AlloysG.H. Dai, A. Menai, J. Bernardini, G. Moya and P. Moser 937

Study of the Nature of the Defects in a Highly Neutron-Irradiated RPV SteelG.H. Dai, P. Moser and J. Van Duysen 941

Recovery Process in a Li-Rich Deformed Al-Li AlloyN. de Diego, D. Segers, L. Dorikens-Vanpraet, J. del Rio and M. Dorikens 945

Positron-Twins Interaction in Deformed TiN. de Diego, A. Serra, D. Segers, L. Dorikens-Vanpraet and M. Dorikens 949

Positron Annhilation in the Ba(PO3 )2 - Na3 AlF6 Glass SystemS. Dedoussis, M. Chardalas, A.K. Liolios, S. Charalambous, A. Shofan, I. Mincov and T.D. Troev 953

Annihilation Characteristics in As-Grown and Electron Irradiated Zn II-VISemiconductorsR.M. de la Cruz, R. Pareja and P. Moser 957

Temperature Dependence of the Positron Annihilation Parameters in III-VI LayeredSemiconductorsR.M. de la Cruz, R. Pareja, A. Segura, V. Muñoz and A. Chevy 961

The Influence of Li in the Nucleation of Vacancy Loops in an Al-Li AlloyJ. del Río and N. de Diego 965

A Recovery Study of Electron Irradiated Al-Li AlloysJ. del Río, N. de Diego and P. Moser 969

Study of Recovery and Recrystallization in Deformed Ni-Cr-Co Superalloys by PositronAnnihilationW. Deng, L.Y. Xiong, J. Jiang, J. Zhu and C.W. Lung 973

Positron Studies of Decomposition in Al-Li Based AlloysG. Dlubek, H. Krause, S. Krause and P. Lademann 977

A Positron Study of the Temperature Dependence of the Guinier-Preston Zone Compositionin Al-Ag AlloysG. Dlubek, R. Unger, K. Pawelzyk, U.H. Gläser and G. Wendrock 981

Positron Trapping Model in N-Type Semiconductors with VacanciesM. Doyama 985

Positron Annihilation in β- and β'-Vanadium Oxide BronzesE. Dryzek and J. Dryzek 989

Study of the Tungsten Bronze Ag0.01 WO3 Using Positron Annihilation MethodJ. Dryzek, A. Placzek and E. Dryzek 993

A Positron Lifetime Study of Defect Recovery in Electron Irradiated Zircaloy-2 and Zr-2.5NbM.M. Eldrup, G.M. Hood, N.J. Pedersen and R.J. Schultz 997

Structural Relaxation in Metallic Glasses by Means of Positron Lifetimes MethodsJ. Filipecki 1001

High-Temperature Equilibrium Vacancy Formation in Ceramic Materials Studied byPositron AnnihilationM. Forster, W. Claudy, H. Hermes, M. Koch, K. Maier, J. Major, H. Stoll and H.E. Schaefer 1005

Positron Studies of Solute Clustering in Al-Ag AlloysH.M. Fretwell, S. Usmar, A. Alam and G. Dlubek 1013

Investigation of Radiation Defects in Proton Irradiated SiliconA.I. Girka, S.V. Merenkov, B.V. Shemaev and A.D. Mokrushin 1017

Diagnostics of Radiation Defects in Silicon CarbideA.I. Girka, A.D. Mokrushin, E.N. Mokhov, S.V. Svirida and A.V. Shishkin 1021

Materials Science Forum Vols. 105-110 g

Positron Trapping by the Platelet Precipitations of AlCuU.H. Gläser, G. Dlubek and R. Krause 1025

Positron Annihilation Study of Metallic and Semiconductor FilmsV.I. Goldanskii, Y.A. Novikov, A.V. Rakov and V.P. Shantarovich 1029

Positron Annihilation Studies in Hf Doped YBCOP. Gopalan, E.R. Priya, M. Premila, C.S. Sundar and K.P. Gopinathan 1033

Structural Relaxation and Crystallization of Electrodeposited Amorphous Co-W AlloysR.I. Grynszpan, E. Chassaing and M. Harmelin 1037

Irradiation-Induced Defects in Graphite and Glassy Carbon Studied by PositronAnnihilationM. Hasegawa, M. Kajino, H. Kuwahara, E. Kuramoto, M. Takenaka and S. Yamaguchi 1041

Positron Annihilation Study of Effects of Aging on Martensite Transformation Defects in aCu-Base Shape Memory AlloyY. He, J. Yang, H. Gu, Y. Wang, J. Yang, C. Zhang and L. Zhao 1047

Positron Lifetime Spectroscopy in Y1Ba2Cu3O6+xD. Hentrich, J.-. Kluin and T. Hehenkamp 1053

Axial Fatigue Damage in Superalloys Measured by Positron AnnihilationD. Hoeckelman and H.P. Leighly 1057

Deformation-Induced Vacancy Clusters in InP Studied by Positron AnnihilationY. Horii, A. Kawasuso, M. Hasegawa, M. Suezawa, S. Yamaguchi and K. Sumino 1061

The Study of ZnO Ceramic Varistors by Positron AnnihilationM.R. Huang, H. Gu, Y. He, Y. Wang, J. Yang and X. Chen 1065

The Study of Neutron-Irradiated Si by Positron AnnihilationM.R. Huang, Y. Wang, J. Yang, Y. He, Y. Guo and C. Liu 1071

Effect of Oxygen Concentration on the Positron Annihilation in the Y-Ba-Cu-0 CeramicsA.Z. Ilyasov, A.V. Mikhailin and B.I. Smirnov 1077

Temperature Variation of Positron Lifetime in YBa2(Cu1-xMx)O7-y(M:Fe,Ni,Zn)S. Ishibashi, R. Yamamoto, M. Doyama and T. Matsumoto 1081

Defects in Electron or Proton Irradiated Undoped and Si-Doped GaAs by PositronAnnihilationY. Itoh, H. Murakami and T. Suzuki 1085

Positron Annihilation and D.S.C. Studies on Quenched-in Defects in NiSbA. Jennane, G.H. Dai, J. Bernardini, G. Moya and P. Moser 1089

Search for Defects in Quasicrystals by Positron AnnihilationI. Kanazawa, T. Iwasita, T. Ohata, S. Nanao and S. Takeuchi 1093

Comparison of Positron-Lifetime Spectroscopy and Differential-DilatometricMeasurements of Equilibrium Vacancies in Copper and α-CuGe AlloysJ.-. Kluin and T. Hehenkamp 1097

Study of Deformed Si and Ge by Positron Lifetime MeasurementsR. Krause, U. Beyer, T. Drost, A. Polity, H.S. Leipner, M. Brohl and H. Alexander 1101

Positron Studies of Annealing and Precipitation in Quenched Al-Sc(0.003-6 at %) AlloysS. Krause, G. Dlubek, A.L. Berezina and K.S. Chuistov 1105

Positron Lifetime Studies of Decomposition in Al-Li and Al-Li-(Cu, Mg or Sc) AlloysS. Krause, H. Krause, G. Dlubek, A.L. Berezina and K.S. Chuistov 1109

Positron Annihilation in Quasicrystalline Alloy Al65Cu20Fe15K. Kristiaková, S. Mäkinen, J. Krištiak and D. Janickovic 1113

On the Behaviour of Positrons in Semiconductors in Presence of External Electric FieldPerturbationN.M. Kulkarni, S. Deuskar and A.D. Shaligram 1117

Effect of On-Line Light Irradiation on Positron Lifetimes and Their Relevance to theDefects in SemiconductorsN.M. Kulkarni, R. Kulkarni, S. Singh and A.D. Shaligram 1121

Positron Annihilation Lifetime Measurement of Electron-Irradiated Fe-Cr AlloysE. Kuramoto, S. Nagano, K. Nishi, K. Makii, Y. Aono and M. Takenaka 1125

Positron Annihilation Measurements in the YBa2Cu3CdxOy SystemA.K. Liolios, M. Chardalas, S. Dedoussis, C.A. Eleftheriadis, L. Papadimitriou, E. Mouhtari, C.Nikolopoulos and S. Charalambous 1129

h Positron Annihilation - ICPA-9

The Investigation of Creep in 12Cr1MoV Steel by Positron AnnihilationS.C. Liu, B. Wang, X.H. Li and S.J. Wang 1133

W-Co-C Films on Ni Substrate Studied by Positron AnnihilationC. Lopes Gil, M.F. Ferreira Marques, A.P. de Lima, M.T. Vieira and A. Cavaleiro 1137

Study of Defects Produced by Laser Surface Melting Using Positron AnnihilationC. Lopes Gil, M.F. Ferreira Marques, A.P. de Lima, R. Vilar, A.M. de Deus, G. Kögel and W.Triftshäuser 1141

Point Defects in ZnO:Mn and Their Relation to Luminescence CentresP. Mascher, M. Liu, A.H. Kitai and W. Puff 1145

Positron Localisation in Metallic GlassesZ. Michno 1149

A Positron Study of Vacancy-Impurity Interaction in Decomposed Cu-Sn AlloyV.S. Mikhalenkov, P.J. Hautojärvi and F. Plazaola 1153

Radiation Centres in Quartz GlassA.D. Mokrushin 1157

Positron Annihilation at Defects in Quenched AluminumH. Murakami, T. Endo and I. Matsuda 1161

Decomposition and Coarsening of Cu-10at% Be and e+-AnnihilationW. Paszkowicz, W. Pahl, V. Gröger and G. Krexner 1165

Positron Study of Copper-Nickel AlloysM.P. Petkov and T.D. Troev 1169

Point Defects in GaP Studied by Correlated Positron Lifetime and Hall MeasurementsA. Polity and R. Krause 1173

Defect Characteristics in Natural and Synthetic Pyrite CrystalsW. Puff, A.G. Balogh, M. Birkholz and S. Fiechter 1177

Investigation of Vacancies in Pdln AlloysW. Puff, A.G. Balogh and H. Wever 1181

Defect Distribution across 6-Inch CZ-Silicon WafersW. Puff, P. Mascher, S.K. Hahn, K.H. Cho and B.Y. Lee 1185

Divacancy Mechanism of Brass Dezincificating Verified by Means of PASW. Qiu, F.X. Gan, L.G. Yao and S. Odendahl 1189

Positron Annihilation Study of Palladium-Deuterium SystemR. Rajaraman, G. Amarendra, D. Vasumathi and B. Viswanathan 1193

Helium in Palladium Studied by Positron AnnihilationR. Rajaraman, G. Amarendra, B. Viswanathan and K.P. Gopinathan 1197

Positron Annihilation Study of Structural Relaxation and Crystallisation in Cobalt BasedMetallic GlassV. Ravindrachary, H.R. Sreepad, A. Chandrashekara, C. Ranganathaiah and S. Gopal 1201

2D-ACAR Measurements in Tungsten with Voids Decorated with DeuteriumG.J. Rozing, A.W. Weeber, P.E. Mijnarends, A. van Veen, J. de Vries and H. Schut 1205

Study of Positronium Atoms in Alkali Halides with Positron Lifetime SpectroscopyH. Saito and T. Hyodo 1209

Positron Studies of Deformed and Quenched FeCu and FeCuNi AlloysK. Sebti, J.M. Clayton, S.G. Usmar and M.A. Alam 1213

The Effect of Change in the Positron Lifetime at the Superconducting Transition inYBa2Cu3O7-delta and the Ortho-Para Conversion of Positronium in MicrovoidsV.L. Sedov, M.A. Hafiz, I.E. Graboy, A.R. Kraul and V.P. Shabatin 1217

Positron Annihilation Study of Nickel Foils Irradiated with High Energy Helium IonsD. Segers, L. De Schepper, D. Geshef, L. Dorikens-Vanpraet, M. Dorikens, J. Paridaens, G.Severne and L.M. Stals 1221

Systematic Change in Positron Lifetime with the Magnitude of Burgers Vectors ofDislocations in MetalsY. Shirai, K. Matsumoto, G. Kawaguchi and M. Yamaguchi 1225

Lattice Defects in Intermetallic Compound TiAl Studied by Positron Lifetime SpectroscopyY. Shirai, K. Matsumoto, M. Yamaguchi, K. Fukuda, R. Taniguchi and S. Tsukui 1229

Positron Annihilation in Cadmium Mercury TellurideC. Smith, P.C. Rice-Evans, N. Shaw and D.L. Smith 1233

Materials Science Forum Vols. 105-110 i

Positron Diffusion in a Fine-Grained Aluminum AlloyA. Somoza, R. Romero and A. Dupasquier 1237

Quenched-in Defects in β Cu-Zn-Al Alloys. A Positron Lifetime StudyA. Somoza, R. Romero and W. Salgueiro 1241

Positron Lifetime Study in an Eutectic Alloy Pb79Sb16Sn5H.R. Sreepad, A. Chandrashekara, V. Ravindrachary, V. Sreeramalu, C. Ranganathaiah and S.Gopal 1245

Positron Lifetime Study of the Interfacial Defects in Nanocrystalline Ni-P AlloysM.L. Sui, L.Y. Xiong, W. Deng, K. Lu, S. Patu and Y.Z. He 1249

Positron Lifetime Studies in Undoped and Sr Doped La2Cu04C.S. Sundar, A. Bharathi, D. Vasumathi and Y. Hariharan 1253

Positron Diagnostics of the Neutron Irradiated and Hydrogen Charged MolybdenumS.V. Svirida, A.V. Shishkin and A.D. Mokrushin 1257

Defect Production and Hydrogen Localization in Deformed NickelC. Szeles, G. Láng and Z. Kajcsos 1261

Defect Recovery in DC-Cast and Hot-Rolled AlMn(FeSiCu) AlloysC. Szeles and A. Vértes 1265

Positron Annihilation in Undoped and Ag-Doped YBa2Cu3O7-x SuperconductorsO. Sausa, J. Krištiak, K. Kristiaková, G. Plesch and F. Hanic 1271

The Application of Positron Annihilation Methods for Investigation of Structure ofModified Fine Powder SilicasS.A. Tishin, E.S. Bakaev, V.A. Tishin, G.M. Kozub, A.A. Chuiko and V.N. Kestelman 1277

Positron Annihilation Lifetime Measurement of Electron Irradiated ZnO CrystalsN. Tomiyama, M. Takenaka and E. Kuramoto 1281

Positron Lifetirne Measurements in 14 MeV Neutron Irradiated BerylliumT.D. Troev and I. Mincov 1285

Positron Annihilation in Molybdenum Irradiated by Fusion Neutrons and PlasticallyDeformedT.D. Troev, I. Mincov and E. Koptelov 1289

A Model for Positron Trapping at Voids in MetalsG. Trumpy and M.D. Bentzon 1293

Negative Temperature Dependence of Positron Trapping in Metal Single CrystalsG. Trumpy and K. Petersen 1297

Oxygen Microclusters in Quenched Si Studied by Positron AnnihilationA. Ueodono, Y. Ujihira, A. Ikari and O. Yoda 1301

A Positron Lifetime Study of Si-Doped Vacuum Melt-Spun AlS.G. Usmar and R.N. Wright 1305

Positron Annihilation Studies of Defect Structures in Vacuum Melt-Spun Pure, Carbon andOxygen Doped AlS.G. Usmar and R.N. Wright 1309

Evidence for Temperature-Dependent Trapping in Pure and Iron-Doped YBa2Cu3O7S.G. Usmar, Y. Xu, A.R. Moodenbaugh and M. Suenaga 1313

The Recovery Behavior of Quenched-In Vacancies in CuAlBe Shape Memory AlloysT.M. Wang, B.Y. Wang, S.Y. Wang, Y.Y. Dong and G.Z. Da 1317

Study of the Crystal Defects in the FeCrNi AlloyT.M. Wang, B.Y. Wang, S.H. Zhang and M. Doyama 1321

Positron Studies of Capillary Condensation of Gases Adsorbed in Mesoporous Solids: APilot StudyN.J. Wilkinson, J.M. Clayton, S.G. Usmar and M.A. Alam 1325

Positron Trapping Rates and Lifetimes of Vacancy-Impurity Complexes in α-AgSb AlloysJ. Wolff, J.-. Kluin and T. Hehenkamp 1329

Vacancy Studies in Melt-Spun Shape Memory AlloysR. Würschum, P. Donner, E. Hornbogen and H.E. Schaefer 1333

Size and Compressibility of Free Volumes in Nanocrystalline MaterialsR. Würschum, W. Greiner, G. Soyez and H.E. Schaefer 1337

Positron Annihilation in Three-Dimensional DefectsL.Y. Xiong, Y. Dong and C.W. Lung 1341

j Positron Annihilation - ICPA-9

The Study of Ni-Ti Shape Memory Alloys by Positron Annihilation Technique and DSCJ. Zhu, R.H. Yu, W. Deng, L.Y. Xiong and Y.S. Li 1345

A Search for Positronium Production at a Monolayer Surface on Boron Nitride PowderI.Y. Al-Qaradawi, F.A. El Khangi and P.C. Rice-Evans 1351

Positronium Production at a Physisorbed Layer of Ethylene on GrafoilI.Y. Al-Qaradawi and P.C. Rice-Evans 1355

Solid Neon Moderator with a Large Activity SourceG.R. Brandes, A.P. Mills, S.S. Voris and D.M. Zuckerman 1359

Positron Workfunction of Diamond C(100) SurfacesG.R. Brandes, A.P. Mills and D.M. Zuckerman 1363

Thermal Evolution of Defect Profiles in H-Implanted Silicon Studied by Slow PositronsR.S. Brusa, M. Duarte Naia, A. Dupasquier, G. Ottaviani, R. Tonini and A. Zecca 1367

Positronium in Silica Powder in the Presence of Oxygen, Nitrogen and Carbon MonoxideF.A. El Khangi, P.C. Rice-Evans and D.L. Smith 1371

Anomalous Positronium Production when Carbon Monoxide is Condensed on ExfoliatedGraphiteH.E. Evans, I.Y. Al-Qaradawi and P.C. Rice-Evans 1375

The Effect of Annealing Unimplanted and Krypton Implanted Uranium Dioxide UsingPositronsH.E. Evans, P.C. Rice-Evans, J.H. Evans-Freeman, D.L. Smith and C. Smith 1379

Annealing Effects at the Near-Surface Region of Gallium ArsenideH.E. Evans, D.L. Smith, P.C. Rice-Evans, G.A. Gledhill and A.M. Moore 1383

The Study of Se- and Si-Implanted GaAs by Slow PositronsS. Fujii, S. Shikata, L. Wei and S. Tanigawa 1387

Positron Beam Analysis of Amorphous SiliconR.A. Hakvoort, S. Roorda, A. van Veen, M.J. van den Boogaard, F.J.M. Buters and H. Schut 1391

Theory of Absorption Coefficient of LEPD Beam due to Positronium Formation at SurfacesA. Ishii 1395

Determination of the Positron Work Functions of Cu(100) and Polycrystalline Fe, Mo, Ni,Pt, Ti and VM. Jibaly, E.C. Kellogg, A. Weiß, A.R. Koymen, D. Mehl and L. Stiborek 1399

Angle-Resolved Monte-Carlo Calculations of Positron Backscattering from SolidsH.H. Jorch 1403

Investigation of Positron States at the Cs/Cu(100) Surface Using Positron AnnihilationInduced Auger Electron Spectroscopy (PAES)A.R. Koymen, K.H. Lee, D. Mehl, A. Weiß and K.O. Jensen 1407

Temperature Dependent Top Layer Composition of Pd on Cu(100)A.R. Koymen, K.H. Lee, G. Yang, H. Zhou and A.H. Weiss 1411

Positron Annihilation Induced Auger Electron Emission from Polycrystalline Fe, Cu, Pdand AuK.H. Lee, A.R. Koymen, D. Mehl, K.O. Jensen and A. Weiß 1415

Positron Annihilation near Fractal SurfacesC.W. Lung, K.M. Deng and L.Y. Xiong 1419

Study of Point Defects in Impurity-Doped ZnSe by a Monoenergetic Positron BeamT. Miyajima, L. Wei, S. Tanigawa, H. Okuyama, K. Akimoto and Y. Mori 1423

Electric Field Effects in Positron Diffusion and Annihilation in the Laminar SubstancesY.A. Novikov, A.V. Rakov and V.P. Shantarovich 1427

Implantation and Diffusion in Thin FilmsM.R. Poulsen, G. Laricchia, M. Charlton, K.O. Jensen and A.B. Walker 1431

Annealing of Silicon Implantation Damage in Indium PhosphideP.J. Simpson, U.G. Akano, P.J. Schultz and I.V. Mitchell 1435

Ion Implantation Damage in Silicon Studied Using Slow Positrons, RBS and InfraredAbsorptionP.J. Simpson, M. Vos, I.V. Mitchell, C. Wu and P.J. Schultz 1439

Positron Beam Studies on Cadmium Mercury TellurideC. Smith, P.C. Rice-Evans, N. Shaw and D.L. Smith 1443

Positron Beam Measurements on Hydrogen Implanted SiliconD.L. Smith, H.E. Evans, C. Smith, P.C. Rice-Evans and J.H. Evans-Freeman 1447

Materials Science Forum Vols. 105-110 k

Characterisation of an SiO2/Si Interface with Slow PositronsD.L. Smith, C. Smith, P.C. Rice-Evans, J.H. Evans-Freeman and H.E. Evans 1451

Positron Lifetimes on Clean Metallic SurfacesR. Steindl, G. Kögel, P. Sperr, P. Willutzki, D.T. Britton and W. Triftshäuser 1455

Investigation of Near Surface Defects by Variable-Energy Positron Lifetime SpectroscopyR. Suzuki, Y. Kobayashi, T. Mikado, H. Ohgaki, M. Chiwaki, T. Yamazaki and T. Tomimasu 1459

Study of Interfacial Reactions in W/Si Systems by a Monoenergetic Positron BeamY. Tabuki, L. Wei, S. Tanigawa, K. Hinode, N. Kobayashi, T. Onai and N. Owada 1463

Study of Oxygen Atom Clustering in Si Induced by External Stress by Means of aMonoenergetic Positron BeamY. Tabuki, L. Wei, S. Tanigawa, R. Nagai and E. Takeda 1467

Variable-Energy Positron-Beam Studies of Si Implanted with MeV-Energy IonsA. Uedono, L. Wei, C. Dosho, Y. Tabuki, H. Kondo, S. Tanigawa and M. Tamura 1471

A Diffusion of Positrons by an Electric Field in MOS TransistorsA. Uedono, L. Wei, Y. Tabuki, H. Kondo, S. Tanigawa and Y. Ohji 1475

Vacancy-Type Defects in Si+- and B+-Implanted Si Probed by a Monoenergetic PositronBeamA. Uedono, L. Wei, Y. Tabuki, H. Kondo, S. Tanigawa, J. Sugiura and M. Ogasawara 1479

Monoenergetic Positron Beam Studies of Near Surface Defects Induced by Low Dose Be-ImplantationA. Uedono, L. Wei, Y. Tabuki, H. Kondo, S. Tanigawa, K. Wada and H. Nakanishi 1483

Characterization of Point Defects in Impurity-Doped GaAs by Slow PositronsL. Wei, J.L. Lee, S. Tanigawa and M. Kawabe 1487

The Effect of Point Defects on the Electrical Activation of Si-Implanted GaAs during RapidThermal Annealing Studied by Slow PositronsL. Wei, J.L. Lee, S. Tanigawa, T. Nakagawa and K. Ohta 1491

The Study of Surface State of III-V Compound Semiconductors by Slow PositronsL. Wei, J.L. Lee, S. Tanigawa, H. Oigawa and Y. Nannichi 1495

Positron Lifetime Study of PolymersJ. Borek and W. Osoba 1501

Positronium Formation in Aqueous Solutions of Surfactant SubstancesV.M. Byakov and S.V. Stepanov 1505

TSES (Time-Selected-Energy-Spectrum) Study of Positronium-Oxygen InteractionsT.B. Chang, G.M. Yang and T. Hyodo 1509

Positronium Polarization in LiquidsJ. Chen and M.J. Scott 1513

A New Lamellar Phase in CTAB/Water/Hexanol SystemS. Roy Choudhury, R. Yadav, A.N. Maitra and P.C. Jain 1517

On the Existense of a Bicontinuous Phase in CTAB/Water/Hexanol Reverse MicellarSystemsS. Roy Choudhury, R. Yadav, A.N. Maitra and P.C. Jain 1521

Triplet Ps Annfhilation Parameters in Abs. EtOH/Cis-2-Pentene and D2O MixturesContaining Pt and Pd CatalystsJ.L. Ciottone and F. Lander 1525

Positron Studies in Some Organic ScintillatorsG. Consolati, D. Gerola and F. Quasso 1529

Positron Annihilation Studies of A-Type ZeolitesM. Debowska and K. Jerie 1533

Positronium Reactions with Cu(II) Ions in WaterP. de Natale, A. Dupasquier, A. Fantola-Lazzarini, E. Lazzarini and A. Rolando 1537

Positron Annihilation in Molecular and Biological SystemsQ.L. Deng, S. Sung, T.A. Mahmoud, G.M. Zhou, X. Lu, S.Y. Shen, K.L. Cheng, E.W. Hellmuth,C.F. Tsai, Y.C. Jean and M.F. Lou 1541

Positron Annihilation in CaSO4.2H2OM. Dimanchev, A. Shofan, T.D. Troev and J. Serna 1545

Free Volume Measurements in Polyimides by Positronium AnnihilationJ.Y. Dolveck, G.H. Dai, P. Moser, M. Pineri, P. Aldebert, M. Escoubes, R. Avrillon and J.C.Mileo 1549

l Positron Annihilation - ICPA-9

The Reduction of Surface Oxide on Ultra-Fine FeNi ParticlesM.M. Eldrup, N.J. Pedersen, B. Larsen, M.D. Bentzon and S. Linderoth 1553

On the Positronium Spin Exchange Reactions Promoted by 3d Aqua IonsA. Fantola-Lazzarini and E. Lazzarini 1557

The Nephelauxetic Effect and o-Ps to p-Ps Conversion Reactions Promoted by Cr(III)ComplexesA. Fantola-Lazzarini and E. Lazzarini 1561

Large Free Volume Defects in n-OctacosaneT. Goworek and W. Górniak 1565

Positronium in Pyroelectric PhenanthreneT. Goworek, W. Górniak and C. Rybka 1569

Ps-Bubble States in Organic Liquids Determined from o-Ps Lifetime DistributionsR.B. Gregory and K.J. Chai 1573

Positron Annihilation Lifetime Studies of Protein HydrationR.B. Gregory, K.J. Chai and W. Su 1577

Monte Carlo Calculations of Radical Proximity Functions around Thermalising Positrons inWaterM.A. Hill and F.A. Smith 1581

Positron Annihilation Studies in Cyclodextrin DerivativesF.H. Hsu, H. Kung and D.W. Armstrong 1585

Response of DBAR Parameter to Ultra-Violet Light Induced Electronic Structure Changesin a Conjugated PolymerW.F. Huang and K.C. Lim 1589

Vapor Absorption Process in Polyethylene Observed by PALY. Ito, R. Lopez, V. Sanchez and L.A. Fucugauchi 1597

A New Model of Positronium Formation - Resonant Positronium FormationY. Ito and Z. Zhang 1601

Investigation of the Structure of Cyclohexane + t-Butanol Solution; Positron Annihilationand Ultrasonic MethodsK. Jerie, A. Baranowski, B. Jezowska-Trzebiatowska and J. Glinski 1605

Structure of Carbon Tetrachloride + t-Butanol Mixtures from Positron Annihilation andUltrasonic Velocity MeasurementsK. Jerie, A. Baranowski, B. Jezowska-Trzebiatowska and J. Glinski 1609

Positron Lifetime Spectroscopy in PolystyreneJ.-. Kluin and F. Faupel 1613

Quenching of Ortho-Positronium Atoms by Nitrobenzene in Various SolutionsY. Kobayashi 1617

Positron AnnihiIation Studies of Homologous Series of Alkoxybenzilidene-ToluidineE.A. Kopelyan 1621

Positron Annihilation Studies in Some Alkyl and Alkyloxy CyanobiphenylsJ. Kumar, C. Kaur, K. Chandramani Singh and P.C. Jain 1625

Meisenheimer Complex Formation Studied by Positron AnnihilationB. Lévay 1629

Studies of Fe2O3/γ-Al2O3 Surfaces by Positron Annihilation, Mössbauer Spectroscopy andScanning Electron MicroscopyL. Lévay, Y. Takashima, E. Kuramoto, J.A. Juhász, B. Lévay and A. Vértes 1633

Positron Annihilation Studies in PMMA PolymerD.D. Lin, B. Wang, X.H. Li and S.J. Wang 1637

Graft Polymerization of Methyl Methacrylate onto Polyethylene Films Studied by PositronAnnihilation TechniqueR. Lopez, V. Sanches, R.A. Morales, Y. Ito and L.A. Fucugauchi 1641

Positron Annihilation Study on Solid Solutions and Mixtures, Using Lifetime SpectroscopyTechniqueJ.C. Machado, C.F. Carvalho, W.F. Magalhaes, A. Marques Netto, G. Duplâtre and J.C. Abbé 1645

Positron Annihilation Spectroscopy of Moisture Sorption in Protective Epoxy CoatingsR.C. MacQueen and R.D. Granata 1649

Positron Annihilation Studies in Some Solid Metallic ComplexesA. Marques Netto, S.I. Klein, R.S. Barbiéri, A.E. Mauro, W.F. Magalhaes and J.C. Machado 1653

Materials Science Forum Vols. 105-110 m

Study of Hemin in Water/Ethyleneglycol Mixtures by Positron Annihilation SpectroscopyM. Tsumbu, G. Yav, K. Malu, L.O. Rostha and C. Dauwe 1657

Studies of Acidity in Solids with Positron Annihilation TechniquesR. Miranda, R. Ochoa and W.F. Huang 1661

Positron Annihilation in Polyvinyliden FluorideH. Murakami, K. Tamaki, N. Hirose and Y. Fujimaki 1667

Energy Loss of Positronium in Helium GasY. Nagashima, T. Hyodo and K. Fujiwara 1671

Free Volumes in Polymers; Positron Annihilation vs. Other MethodsK. Okamoto, K. Tanaka, N. Katsube, O. Sueoka and Y. Ito 1675

Positron Annihilation and Mössbauer Effect Studies of Iron-Dextran ComplexesM.I. Oshtrakh, E.A. Kopelyan, V.A. Semionkin, A.B. Livshits, V.E. Krylova and A. Kozlov 1679

Isochronal Annealing Study of Positron Trapping Centres in a Polymer MatrixC. Ranganathaiah, A. Chandrashekara, V. Ravindrachary, H.R. Sreepad, V. Sreeramalu and S.Gopal 1683

Positron Annihilation Studies in Lysozyme and CatalaseY. Rohilla, K.P. Sing, S. R. Choudhury and P.C. Jain 1687

Positron Lifetimes and Free Volume of Polycarbonate under Tensile StrainM.Y. Ruan, H. Moaddel, Z. Yu, A.M. Jamieson, R. Simha and J.D. McGervey 1691

Combined Lifetime-Momentum Measurement of Ortho-Positronium in PolymersM.Y. Ruan, W. Zheng and J.D. McGervey 1695

"Positronium Bubble" and Positronium Chemical Reactions in LiquidsA.I. Ryzhkov and V.P. Shantarovich 1699

Dependence of o-Ps Lifetime Parameters on n-Alkane Chain Length and on TemperatureF.A. Smith and N.V. Seetala 1703

Positron Lifetime and Optical Studies on Polyethylene GlycolH.R. Sreepad, M. Marthandappa, C. Ranganathaiah and S. Gopal 1707

Magnetic Quenching Experiments in Liquid Rare GasesJ.J. Steinbacher and A.T. Stewart 1711

On the Broad Momentum Component in Condensed Rare GasesJ.J. Steinbacher and A.T. Stewart 1715

Variation of Free Volumes in Polyvynil Alcohol Studied by Positron AnnihilationY. Suda, A. Uedono and Y. Ujihira 1721

Positron Annihilation in Epoxy ResinsT. Suzuki, Y. Oki, M. Numajiri, T. Miura, K. Kondo, S. Fujita and Y. Ito 1725

Positron Lifetime Spectroscopy Study of γ-Irradiated Epoxy Resin: Dose and TimeDependent MeasurementsK. Süvegh, F. Ranogajec, M. Komor-Ranogajec, E. Tálas, M. Ovári and A. Vértes 1729

Positron Annihilation on the Pure and Modifed Surfaces of Thirsty GlassesK. Süvegh, Z. Papp, S. Göbölös and A. Vértes 1733

Increase of I4 at Melting Point Found in Polyethylene and Serious Thermal HysteresisFound in PolypropyleneM. Tanaka, K. Takebe, A. Uedono, Y. Ujihira, K. Horie and T. Asanuma 1737

Investigation of Polymer Relaxation after Deformation by Positron Annihilation (forPolyimid)S.A. Tishin, M.I. Capoveckiy and V.A. Tishin 1741

Free Volumes in Amine-Cured Epoxy Studied by Positron AnnihilationE. Ueda, A. Uedono, Y. Ujihira, S. Yamashita, T. Naito and K. Horie 1745

Two Long Lifetimes in Liquid Normal HexaneS. Vass, C. Szeles, K. Süvegh and A. Vértes 1749

Positron Annihilation in Elastomers with Simulated Modification of Free VolumeS.N. Vassermann, A.R. Grupper and S.A. Tishin 1753

Study of Energy Transfer Process in Light Absorbing Pigments: Chlorophyll, UsingPositron Annihilation TechniqueP.B. Vidyasagar, M. Banerjee, A.T. Palwe, G.R. Kulkarni, A.D. Shaligram and N.M. Kulkarni 1757

Thermal Variation of the Lifetimes in Five Epoxy ResinsJ.T. Waber, R.H. Wang and J.G. Williams 1761

n Positron Annihilation - ICPA-9

A Positron Lifetime Study of Solid-Solid Transitions in Partially Polymerized HDODAW.W. Walker and J.W. Harrell 1771

Some Subjects of Positron Annihilation Studies in PolymersS.Y. Wang 1775

Positron Annihilation Kinetic Energy Distributions of Different Lifetime Components inTeflon PolymerS.Y. Wang, T.B. Chang and H.D. Wang 1779

Temperature Curves of Positron Annihilation Lifetime Parameter in PolyethyleneTeraphthalateS.Y. Wang, B.G. Nong, T.B. Chang and H.D. Wang 1783

Study of Composition of Positron Annihilation Lifetime Spectrum and Temperature Effecton Lifetime Parameters in Polymer PVC. Part I.S.Y. Wang, Y.M. Shentu, H.D. Wang and T.B. Chang 1787

Study of Compositlon of Positron Annihilation Lifetime Spectrum and Temperature Effecton Lifetime Parameters in Polymer PVC. Part II.S.Y. Wang, Y.M. Shentu, H.D. Wang and T.B. Chang 1791

The Relations between Positron Annihilation and Conductivity of Non-Metal ConductorsY.Y. Wang and J.H. Wang 1795

Probing Redox Reaction of Unusual Valence Nickel (IV) in Aqueous Medium byPositroniumY.Y. Wang, Z.P. Wang, L.L. Yang, Y.H. Guo and M.R. Huang 1804

Decrease in o-Ps Formation in Polymers during Positron Lifetime MeasurementsM. Welander and F.H.J. Maurer 1811

Effect of Sorbed Water and Amide Content on the o-Ps Lifetime in PolyamidesM. Welander and F.H.J. Maurer 1815

Positron Behaviour in PHB PolymerN.J. Wilkinson, D. Archer, J.M. Clayton, S.G. Usmar and M.A. Alam 1819

Positron Annihilation Studies in Aqueous and Non-Aqueous Binary Solutions of TTABR. Yadav, P. Hossein Khani and P.C. Jain 1823

A New Positron PolarimeterM. Allet, K. Bodek, J. Deutsch, F. Gimeno-Nogues, W. Hajdas, J. Lang, R. Müller, O. Naviliat-Cuncic, I. Pepe, R. Prieels, P.A. Quin, N. Severijns, G. Spiekerman, J. Sromicki, E. Thomas andJ. Zejma 1829

A Slow-Positron Source Project Using the Photon Factory Electron LinacA. Asami, A. Enomoto, H. Kobayashi, T. Kurihara, K. Nakahara and T. Shidara 1833

First Tests of an Antiproton Anticyclotron at LEARE.C. Aschenauer, D. Cauz, P. DeCecco, J. Eades, J.-. Egger, K. Elsener, F. Formisano, G. Gorini,D. Horváth, I. Krafcsik, V. Lagomarsino, G. Manuzio, R. Poggiani, L.M. Simons, G. Testera, G.Torelli and F. Waldner 1837

Beyond 106-Count Lifetime Spectra Using Hamamatsu Tubes and Pilot UT. Bretagnon, K. Abdurahman, D. Kerr and S. Dannefaer 1841

A High Resolution Doppler-Broadening SpectrometerD.T. Britton, W. Junker and P. Sperr 1845

Tungsten Singlecrystal and Polycrystalline Foils Used as First Transmission ModeratorR.S. Brusa, M. Duarte Naia, E. Galvanetto, P. Scardi and A. Zecca 1849

Improvements in the Acquisition and Analysis of Doppler-Broadening Annihilation SpectraR.S. Brusa, M. Duarte Naia, R. Grisenti and A. Zecca 1853

On the Evaluation of the Fraction of Orthopositronium in Lifetime SpectraC. Dauwe 1857

S-Parameters and Count-RateL. Dorikens-Vanpraet, S. Segers and M. Dorikens 1861

Development and Use of a Multi-Wire Proportional Chamber Positron Camera at a ClinicalSite without a CyclotronM.A. Flower, R.J. Ott, J.E. Bateman, M. Brada, M. O'Connell, C. Harmer and V.R. McCready 1863

Electrostatic-Transport Positron Beams: Recent Developments at UEAA. Goodyear and P.G. Coleman 1867

Recent Developments in the Determination of Positron Annihilation Rate Distributions byRegularized Solution of Integral EquationsR.B. Gregory 1871

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Monte-Carlo Calculation of Positron Implantation in Multi-Layered MaterialsR.B. Gregory and W. Su 1875

Rare-Gas Solids as Positron Moderators in "Critical Environments"T. Grund, K. Maier and A. Seeger 1879

Dynode Timing ElectronicsR.W. Hollander, M.A. Singelenberg and H. Schut 1883

Development of a New Positron-Camera for 2D-ACAR MeasurementsR.W. Hollander and C.W.E. van Eijk 1889

Intense Brightness Enhanced Positron Beam from an Electron Linac and its ApplicationsY. Ito, I. Kanazawa, O. Sueoka and S. Takamura 1893

Continuous Lifetime Distribution Using Laplace Inversion MethodY.C. Jean, F. Zandienadem and Q.L. Deng 1897

Use of Image Processing Techniques in the Analysis of Positron Annihilation SpectraH.H. Jorch and N.M. Znotinas 1901

Performance Analysis in Positron Annihilation MethodsZ. Kajcsos and W. Meyer 1905

High-Purity CsI Scintillators for Fast Timing ApplicationsS. Keszthelyi-Lándori, Z. Kajcsos and C. Szeles 1911

A Pulsed Positronium BeamR. Khatri, K.G. Lynn, A.P. Mills and L.O. Roellig 1915

An Electrostatic System for Investigating Positron - Atom CollisionsA. Kövér, G. Laricchia and M. Charlton 1919

Data Analysis and Diagnostic Package for Lifetime Spectra of Multilayered SamplesN.M. Kulkarni and A.D. Shaligram 1923

Electro-Production of Intense Slow Positron BeamsR. Ley 1927

Compact, Magnetically Guided Slow Positron Beam for Defect StudiesL. Liszkay, H. Huomo, K.J. Rönkä, K. Rytsölä and P.J. Hautojärvi 1931

The Positron-Clock PrincipleK. Maier, J. Major, A. Seeger, H. Stoll, P. Wesolowski and M. Koch 1935

Study of Positronium in Condensed Matter with Polarized PositronsJ. Major, A. Seeger and O. Stritzke 1939

Generalized Tent FunctionsA.P. Mills 1943

Current Status of the MUP-PET Positron Camera DevelopmentR.J. Ott, J. Suckling, J.E. Bateman and R. Stevenson 1947

Modifications to the Ghent Slow Positron BeamJ. Paridaens, D. Segers, M. Dorikens and L. Dorikens-Vanpraet 1951

Performance Characteristics of Eighteen Positron Lifetime SpectrometersT.J. Paulus 1955

PAS Studies on the New Topic: Cold Nuclear FusionW.C. Qiu, Q. Dong, F.X. Gan and S.J. Wang 1961

Computerized Positron Lifetime Spectrometer and Graphic Interface for the LifetimeSpectra AnalysisI.A. Repin, S.V. Svirida, M.B. Artemova, A.V. Shishkin, V.M. Kozlov, S.V. Merenkov, P.B.Popov and A.D. Mokrushin 1965

A Positron Annihilation Age-Momentum Correlation Measurement SystemH. Saito, Y. Nagashima and T. Hyodo 1967

On Source Contributions to Positron Lifetime SpectraA. Saoucha, N.J. Pedersen and M.M. Eldrup 1971

Optimization of Beam Parameters for Positron MicroanalysisL.J. Seijbel, P. Kruit, A. van Veen and H. Schut 1977

Maximum Entropy Analysis of Positron Annihilation Lifetime SpectraA. Shukla and M. Peter 1981

Low Energy Positron Flux Generator for Microstructural Characterization of Thin FilmsJ.J. Singh, A. Eftekhari and T.L. St. Clair 1985

p Positron Annihilation - ICPA-9

β+γE Age-Momentum-Correlation Measurements with an MeV Positron BeamH. Stoll, P. Wesolowski, M. Koch, K. Maier, A. Seeger and J. Major 1989

Positron Pulsing System for Variable Energy Positron Lifetime SpectroscopyR. Suzuki, Y. Kobayashi, T. Mikado, H. Ohgaki, M. Chiwaki, T. Yamazaki and T. Tomimasu 1993

Test of 3D Momentum Density and Fermi Surface ReconstructionR. Suzuki and S. Tanigawa 1997

An Experiment to Demonstrate the P-Parity Conservation in e--e+ AnnihilationT.D. Troev 2001

Data Acquisition and Analysis Program POSITR. Unger 2005

A New Concept for a Pulsed Positron SourceP. Willutzki, P. Sperr, D.T. Britton, G. Kögel, R. Steindl and W. Triftshäuser 2009

The Focusing of a Positron Beam by an Electrostatic Lens and an Increasing Magnetic FieldR.W.K. Wong, R. Unwin, C.B. Beling and S. Fung 2013

Positronium Beam ExperimentationN. Zafar, G. Laricchia, M. Charlton and T.C. Griffith 2017

Spherical Symmetry Brightness Enhancer for Accelerator and Reactor-Based PositronBeamsA. Zecca and R.S. Brusa 2021

Summary on Positron and Positronium ChemistryJ.C. Abbé 2025

Physics Summary TalkA. Seeger 2033