Stark Spectroscopy of CH 3 F Solvated in Helium Nanodroplets Alexander M. Morrison Steven Flynn Tao...

Stark Spectroscopy of CHStark Spectroscopy of CH33F F Solvated in Helium NanodropletsSolvated in Helium Nanodroplets

Alexander M. MorrisonSteven Flynn

Tao LiangGary E. Douberly

Department of Chemistry, University of Georgia

http://douberly.myweb.uga.edu

Supported by: UGA Office of the Vice President for Research University of Georgia Research Foundation

Coupling Rotational Relaxation to He excitationsCoupling Rotational Relaxation to He excitations

Rotational Energy (cm-1)

Den

sity

of S

tate

s

|1,1

|1,1

q Q1(

1)ns = E

|J,K

ener

gy

M

+1

+1

-1

-10

0

~6 cm-1

•Formation of Droplets

•Doping of Droplets

•Excitation of solvated species

•Bolometer or mass spectrometer detection

UGA HENDI ApparatusUGA HENDI Apparatus

Wavemeter output <10MHz resolution

Lockheed Martin Aculight Argos Lockheed Martin Aculight Argos Model 2400 PPLN cw OPOModel 2400 PPLN cw OPO

2550-4000 cm-1

~ 1 Watt (idler)

13CH3F

ν1/2ν5

ν1/2ν5

ν4

CH3F-N2

Upper Diad (1/25) = 0.14 cm-1

Lower Diad (1/25) = 0.06 cm-1

0

5

10

15

20

2860

2870

2880

Ene

rgy

(cm

-1)

ns = Ens = A1

|J,K

|0,0|1,1

|2,2

|0,0

|1,1

|2,2

Parallel band: K = 0

q R0(

0)

q R0(

1)

q R1(

1)

q Q1(

1)

q P0(

1)gns=16 gns=16

0

5

10

15

20

2860

2870

2880

Ene

rgy

(cm

-1)

ns = Ens = A1

|J,K

|0,0|1,1

|2,2

|0,0

|1,1

|2,2

Parallel band: K = 0Parallel band: K = 0

q R0(

0)

q R0(

1)

q R1(

1)

q Q1(

1)

q P0(

1)

q R0(

0)

q R0(

1)

q R1(

1)

q Q1(

1)

q P0(

1)gns=16 gns=16

Lower Diad (Lower Diad (11/2/255))KJK”(J’’)

v' = A1

HeliumB=0.388 cm-1

D''=0D'=0.0054 cm-1

0=2859.373 cm-1

Gas Phase *B''=0.852 cm-1

0=2863 cm-1

* J. Champion, A. Robiette, I. Mills, G. Graner, J. Mol. Spec. 96, 422, (1982).

KJK”(J’’)

Lower Diad (Lower Diad (11/2/255))

Elaser

EStark

Elaser

EStark

or

M = 0 M = ±1

Parallel PolarizationM = 0

Elaser

EStark

Lower Diad (Lower Diad (11/2/255))

Perpendicular Polarization M = ±1

Elaser

EStark

qQ1(1)

+1

0

-1

+1

0

-1

|1,1

|1,1

E (kv/cm)

Elaser

EStark

Elaser

EStark

" = 1.90 D' = 1.92 D

" = 1.90 D' = 1.92 D

νν44 asymmetric stretchasymmetric stretch

0

5

10

15

20

2860

2870

2880

Ene

rgy

(cm

-1)

ns = Ens = A1

|J,K

|0,0|1,1

|2,2

|0,0

|1,1

|2,2

v' = E

Perpendicular band: K = ±1

r R0(

1)

r Q0(

1) p P1(

1)

r R0(

0) p Q1(

1)p R

1(1)

r R1(

1)

0

5

10

15

20

2860

2870

2880

Ene

rgy

(cm

-1)

ns = Ens = A1

|J,K

|0,0|1,1

|2,2

|0,0

|1,1

|2,2

v' = E

Perpendicular band: K = ±1Perpendicular band: K = ±1

r R0(

1)

r Q0(

1) p P1(

1)

r R0(

0) p Q1(

1)p R

1(1)

r R1(

1)

r R0(

1)

r Q0(

1) p P1(

1)

r R0(

0) p Q1(

1)p R

1(1)

r R1(

1)

HeliumB=0.388 cm-1

A=4.31 cm-1

0=2996.50 cm-1

Gas Phase *B''=0.852 cm-1

A''=5.18 cm-1

0=2998.438 cm-1

* J. Champion, A. Robiette, I. Mills, G. Graner, J. Mol. Spec. 96, 422, (1982).

KJK”(J’’)

νν44 asymmetric stretchasymmetric stretch

Perpendicular Polarization M = ±1

Elaser

EStark

qQ1(1)

+1

0

-1

+1

0

-1

|1,1

|1,1

E (kv/cm)

Thanks!Thanks!

Gary Douberly

Fellow Lab MatesSteven FlynnTao Liang

SupportUniversity of Georgia Research FoundationUGA Office of the Vice President for Research