Vibration--translation energy transfer in anharmonic diatomic molecules. 2. The vibrational quantum number dependence

Technical Report · Sun Jun 01 04:00:00 EDT 1975

OSTI ID:7329974

Mckenzie, R L

A semiclassical model of the inelastic collision between a vibrationally excited anharmonic oscillator and a structureless atom was used to predict the variation of thermally averaged vibration--translation rate coefficients with temperature and initial-state quantum number. Multiple oscillator states were included in a numerical solution for collinear encounters. The results are compared with CO--He experimental values for both ground and excited initial states using several simplified forms of the interaction potential. The numerical model was also used as a basis for evaluating several less complete but analytic models. Two computationally simple analytic approximations were found that successfully reproduced the numerical rate coefficients for a wide range of molecular properties and collision partners. Their limitations were also identified. The relative rates of multiple-quantum transitions from excited states were evaluated for several molecular types. (auth)

• Research Organization: National Aeronautics and Space Administration, Moffett Field, Calif. (USA). Ames Research Center
• OSTI ID: 7329974
• Report Number(s): N-75-28858; NASA-TM-X-62453; A-6152(Vol.2)
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
CRYOGENIC FLUIDS
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
FLUIDS
GROUND STATES
HELIUM
INELASTIC SCATTERING
KINETICS
MATHEMATICAL MODELS
MOLECULE COLLISIONS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
REACTION KINETICS
SCATTERING
SEMICLASSICAL APPROXIMATION
VIBRATIONAL STATES