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Rotational relaxation, anharmonic shifts, and excited state absorption in CH/sub 3/CHF/sub 2/

Journal Article · · J. Chem. Phys.; (United States)
OSTI ID:5294632
An intense nsec CO/sub 2/ laser pulse was used to deplete a fraction of the rotational population of CH/sub 3/CHF/sub 2/. Rotational redistribution was monitored with a cw probe laser. The measured rotational self-relaxation rate constant is approx. 1.7 X 10/sup -9/ cm/sup 3//sec. The rate constants for relaxation collisions with H/sub 2/ and N/sub 2/ are 2.9 x 10/sup -10/ and 1.1 X 10/sup -10/ cm/sup 3//sec respectively. Measurements of the instantaneous absorption of excited vibrational levels which are directly populated by the short laser, yield anharmonic shifts (2w/sub eXe/) of approx. 7.5 cm/sup -1/ for the 942 cm/sup -1/ C-F stretchmode of this molecule.
Research Organization:
Aves Everett Research Lab., MA
OSTI ID:
5294632
Journal Information:
J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 72; ISSN JCPSA
Country of Publication:
United States
Language:
English