High-temperature vibrational--rotational relaxation in He--H/sub 2/

Journal Article · Sun Jan 15 04:00:00 EST 1978 · J. Chem. Phys.; (United States)

OSTI ID:5330321

Tarr, S M; Rabitz, H

The vibrational--rotational relaxation of He--H/sub 2/ at high temperatures is studied by applying a recently developed exponential distorted wave (EDW) technique to calculate inelastic cross sections. Particular attention is given to the role of the high rotational states in vibrational relaxation; transfer through these states is shown to be important at high temperatures. For conditions simulating He--H/sub 2/ shock tube experiments, a single exponential decay is found to describe the n=0..-->..n'..-->..1 vibrational relaxation for all time. It is shown that this fortunate circumstance, which is important in the interpretation of such experiments, does not necessarily extend to other widely differing experimental conditions.

• Research Organization: Department of Chemistry, Princeton University, Princeton, New Jersey 08540
• OSTI ID: 5330321
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 68:2; ISSN JCPSA
• 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
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
HELIUM
HIGH TEMPERATURE
HYDROGEN
MOLECULE COLLISIONS
NONMETALS
RARE GASES
RELAXATION
ROTATIONAL STATES
VIBRATIONAL STATES