Mechanisms and rate constants for the vibrational relaxation of HD(v = 4, 5, and 6) in collisions with HD, /sup 4/He, and D/sub 2/

Journal Article · Sun Jul 15 04:00:00 EDT 1984 · J. Chem. Phys.; (United States)

OSTI ID:6718667

Rohlfing, E A; Rabitz, H; Gelfand, J; Miles, R B

The relaxation of highly vibrationally excited HD with several collision partners is examined using direct overtone excitation and time-resolved photoacoustic detection of the subsequent change in translational energy of the gas. Analysis of such data for HD(v = 4, 5 and 6) self-relaxation yields vibration-translation (V-T) and vibration--vibration (V--V) rate constants for collisions between HD(v = 1 to 6) and HD(v = 0). The V-T rate constant becomes larger than the V--V rate constant above v = 4. Similarly, relaxation data for the HD(v = 4 and 5)--/sup 4/He systems is analyzed and the HD--/sup 4/He V-T rate constants at v = 4 and v = 5 are presented. The differences in the quantum number scaling of the V-T rates for the HD--HD and HD--/sup 4/He systems are discussed. Finally, the time-resolved photoacoustic data for HD(v = 4) relaxing in collisions with D/sub 2/ shows the effect of the rapid, near-resonant V--V energy transfer between HD in the v = 1 through v = 4 levels and D/sub 2/ in v = 0.

• Research Organization: Department of Chemistry, Princeton University, Princeton, New Jersey 08544
• OSTI ID: 6718667
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 81:2; 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
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
FLUIDS
GASES
HELIUM
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
HYDROGEN ISOTOPES
ISOTOPES
KINETICS
LIGHT NUCLEI
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RARE GASES
RELAXATION
STABLE ISOTOPES
VIBRATIONAL STATES