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
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OSTI ID:5306272
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Related Subjects
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTROSCOPY
COLLISIONS
CRYOGENIC FLUIDS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN
LASER RADIATION
MOLECULE COLLISIONS
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTON COLLISIONS
PHOTON-MOLECULE COLLISIONS
PULSE TECHNIQUES
RADIATIONS
RELAXATION
ROTATIONAL STATES
SPECTROSCOPY
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTROSCOPY
COLLISIONS
CRYOGENIC FLUIDS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN
LASER RADIATION
MOLECULE COLLISIONS
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTON COLLISIONS
PHOTON-MOLECULE COLLISIONS
PULSE TECHNIQUES
RADIATIONS
RELAXATION
ROTATIONAL STATES
SPECTROSCOPY