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/ AD—AO~ 1 135 MASSACHUSETTS UNIV AMHERST ASTRONOMY RESEARCH FACILITY F/S 7/44INFRARED EMISSION SPECTROSCOPY OF LOW PRESSURE GASEOUS DISCHARG——ETC(tJ)•NOV 77 P HANSEN. H SAKAI. ii STRONG F19628 76—C—0087

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INFRARED EMISSION SPECTROSCOPY OF LOW PRESSURE GASEOUS DISCHARGES

Peter Hansen

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~~~~~~~~~~~~~~

Haji me Sakai• >..r ~ John Strong

J Astronomy Research FacilityJ L.t.J University of Massachusetts/ • —~ Amherst, MA 01003~~~~~

~~~~~~~

1 November 1977

Scientific ~eport No. 1

[Approved for public release; distribution unlimited.

• D D CAIR GEOPHYSICS LABORATORY

UNITED STATES AIR FORCEHANSCOM AFB , MASSACHUSET~~ 01731

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dQualified requestors may obtain additional copies from the DefenseDocumentation Center. All others should apply to the NationalTechnical Information Service.

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~ASE0US DISCRARGE~~ .. Scientific Report No. 1

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A th :~~~’ 1 i t n i t t ’~~r : m - t ’ r i r u::rr l to measure i n f r a r ed radiat ion in~‘m i s ~~.on : r - ~ a ~a. -u: dis~ har~ e column . The discharge column is containedin a ~O—mcte r ~~i t n~ er~~ t }i r e l l us ing a I .~—rn e t , :r central electrode . Byopt ic :~1i:i t r i p l e pa ss ing , the equ ivaien t p ath length achieved through thedirc i ar Ce colum n i~ 36 meters . Spectral resolut i on near ~~~~~~~ cm~~~~is~bta ned . ut~ - 1 spectra in the 1800 — 8O00/cm~~ region are present ed .The d ischarge colum n cons is t s of a 1—meter diameter steel tube with a

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ranges from 1 to 14 k i lowat ts . Due to the discharge geometry , pressure is

l imi ted to the range of 0.1 to 0.6 torr ; however , broad adjustments in

current density are possible over this pressure range .

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