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

2. Coupling Rotational Relaxation to He excitations Rotational Energy (cm -1 ) Density of States |1,1  q Q 1 (1)  ns = E |J,K  energy M +1 0 0 ~6 cm -1

3. Formation of Droplets Doping of Droplets Excitation of solvated species Bolometer or mass spectrometer detection UGA HENDI Apparatus

4. Wavemeter output <10MHz resolution Lockheed Martin Aculight Argos Model 2400 PPLN cw OPO 2550-4000 cm -1 ~ 1 Watt (idler)

5. 13 CH 3 F ν 1 /2ν 5 ν4ν4 CH 3 F-N 2

6. Upper Diad ( 1 /2 5 )  = 0.14 cm -1 Lower Diad ( 1 /2 5 )  = 0.06 cm -1

7. Lower Diad ( 1 /2 5 )  K  J K” (J’’)  v' = A 1

8. Helium B=0.388 cm -1 D''=0 D'=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).  K  J K” (J’’) Lower Diad ( 1 /2 5 )

10. E laser E Stark E laser E Stark or  M = 0  M = ±1

11. Parallel Polarization  M = 0 E laser E Stark Lower Diad ( 1 /2 5 )

12. Perpendicular Polarization  M = ±1 E laser E Stark q Q 1 (1) +1 0 +1 0 |1,1  E (kv/cm)

13. E laser E Stark E laser E Stark  " = 1.90 D  ' = 1.92 D

14.  " = 1.90 D  ' = 1.92 D

15. ν 4 asymmetric stretch

16. Helium B=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).  K  J K” (J’’) ν 4 asymmetric stretch

17. Perpendicular Polarization  M = ±1 E laser E Stark q Q 1 (1) +1 0 +1 0 |1,1  E (kv/cm)

18. Thanks! Gary Douberly Fellow Lab Mates Steven Flynn Tao Liang Support University of Georgia Research Foundation UGA Office of the Vice President for Research