Dynamics of inelastic H+D/sub 2/ collisions: Product quantum state distributions at 1. 1 and 1. 3 eV collision energy
We have measured the quantum state distributions of rotationally and vibrationally excited D/sub 2/ formed in inelastic H+D/sub 2/ collisions at 1.1 and 1.3 eV, under effectively single-collision conditions. The distributions are derived from highly time-resolved CARS spectra of D/sub 2/. The hydrogen atoms are generated by laser photolysis of HI in an HI/D/sub 2/ gas mixture. The D/sub 2/ produced in these inelastic collisions is less rotationally and vibrationally excited than the HD produced in reactive H+D/sub 2/ collisions at the same energies. The results also show that at 1.3 eV the H+D/sub 2/ cross section for producing vibrationally excited D/sub 2/ is about one-half the cross section for producing vibrationally excited HD. The measured D/sub 2/ quantum state distributions are in excellent agreement with distributions derived from quasiclassical trajectory calculations on an 'iab initio H/sub 3/ potential surface. However, the quasiclassical trajectory calculated ratio of the vibrationally inelastic nonreactive cross section to the vibrationally nonadiabatic reactive cross section is about 1.5.
- Research Organization:
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 and Department of Chemistry, Carroll College, Waukesha, Wisconsin 53186
- OSTI ID:
- 5561640
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 83:5; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
DEUTERIUM
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EXCITED STATES
HYDROGEN
HYDROGEN ISOTOPES
INELASTIC SCATTERING
ISOTOPES
LIGHT NUCLEI
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
ROTATIONAL STATES
SCATTERING
STABLE ISOTOPES
VIBRATIONAL STATES