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Vibrational relaxation of highly excited CF[sub 2]Cl[sub 2] and CF[sub 2]HCl by montomic gases: Dependence on energy and mass

Journal Article · · Journal of Physical Chemistry; (United States)
DOI:https://doi.org/10.1021/j100123a027· OSTI ID:6257549
 [1]
  1. Univ. of Iowa, Iowa City (United States)
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The relaxation of vibrationally excited CF[sub 2]Cl[sub 2] and CF[sub 2]HCl (the average energy, (E), ranged from 2000 to 30 000 cm[sup [minus]1]) by rare gases was monitored with time-resolved optoacoustics. Above 8000-10 000 cm[sup [minus]1], the collision efficiency, [beta], was independent of excitation energy and deactivator: [beta](CF[sub 2]Cl[sub 2]) = 1.7 X 10[sup [minus]3] and [beta](CF[sub 2]HCl) = 1.5 X 10[sup [minus]3]. The average energy removed per collision, [much lt][Delta][much gt], is linear with (E). For (E) <8000-10 000 cm[sup [minus]1], [beta] decreases with decreasing energy; the energy dependence was similar for all deactivators. The present experiments suggest that the energy dependence of the observed K[sub VT] is due to an energy dependence on the microscopic rate coefficient for relaxation and not the initial distribution of vibrational energy. 26 refs., 3 figs., 1 tab.

DOE Contract Number:
FG02-87ER13700
OSTI ID:
6257549
Journal Information:
Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:21; ISSN JPCHAX; ISSN 0022-3654
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical &amp; Physicochemical Properties
400500* -- Photochemistry
CARBON DIOXIDE LASERS
COLLISIONS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GAS LASERS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
INFRARED SPECTROMETERS
LASERS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOACOUSTIC SPECTROMETERS
RARE GASES
SPECTROMETERS
VIBRATIONAL STATES