Three-body collision contributions to recombination and collision-induced dissociation. II. Kinetics

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.477349· OSTI ID:662183

T Pack, R; Walker, R B; Kendrick, B K ^[1]

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1. Theoretical Division (T-12, MS B268), Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Detailed rate constants for the reaction Ne+Ne+H{r_equilibrium}Ne{sub 2}+H are generated, and the master equations governing collision-induced dissociation (CID) and recombination are accurately solved numerically. The temperature and pressure dependence are explored. At all pressures, three-body (3B) collisions dominate. The sequential two-body energy transfer (ET) mechanism gives a rate that is more than a factor of two too small at low pressures and orders of magnitude too small at high pressures. Simpler models are explored; to describe the kinetics they must include direct 3B rates connecting the continuum to the bound states and to the quasibound states. The relevance of the present reaction to more general CID/recombination reactions is discussed. For atomic fragments, the 3B mechanism usually dominates. For diatomic fragments, the 3B and ET mechanism are competitive, and for polyatomic fragments the ET mechanism usually dominates. {copyright} {ital 1998 American Institute of Physics.}

• OSTI ID: 662183
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 16 Vol. 109; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
66 PHYSICS
ATOM-MOLECULE COLLISIONS
CHEMICAL REACTION KINETICS
CROSS SECTIONS
DISSOCIATION
HYDROGEN
NEON
RECOMBINATION
THREE-BODY PROBLEM