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 00:00:00 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), Vol. 81:2
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
DEUTERIUM
MOLECULE-MOLECULE COLLISIONS
HELIUM
ATOM-MOLECULE COLLISIONS
HYDROGEN DEUTERIDE
RELAXATION
ENERGY TRANSFER
KINETICS
VIBRATIONAL STATES
ATOM COLLISIONS
COLLISIONS
DEUTERIDES
DEUTERIUM COMPOUNDS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RARE GASES
STABLE ISOTOPES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena