Molecule--molecule collisions: Semiclassical calculations of rotational excitation for the H/sub 2/--CO/sub 2/ system using the exponential approximation

Journal Article · Tue Feb 15 04:00:00 EST 1977 · J. Chem. Phys.; (United States)

OSTI ID:7130498

Guha, E; Saha, S

The formalism of the semiclassical exponential approximation is developed for rotational transitions in collisions between two linear molecules. The H/sub 2/ and CO/sub 2/ molecules are treated as rigid rotors and their interaction potential includes anisotropic contributions from the short-range repulsive forces as well as from the long-range dispersion, induction, and electrostatic interactions. The calculations are made over a wide range of energy below the rotational threshold of H/sub 2/ and for several initial rotational states of both molecules. Neglecting the small probability of de-excitation of H/sub 2/ when possible, the rotational inelasticity in CO/sub 2/ is found to depend significantly on the rotational state of its collision partner. The effect of varying the repulsive anisotropy parameter on the inelastic cross sections is also investigated. (AIP)

• Research Organization: Department of General Physics and X rays, Indian Association for the Cultivation of Science, Calcutta-700032, India
• OSTI ID: 7130498
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 66:4; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
CRYOGENIC FLUIDS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLUIDS
HYDROGEN
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
ROTATIONAL STATES