Collisional dissociation of dimers by monomers in rare gases

Journal Article · Mon Feb 15 04:00:00 EST 1982 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.443221· OSTI ID:5840104

Thompson, D L

Cross sections and thermal rate coefficients for single-collision dissociation in ground-state Rg/sub 2/ by Rg (Rg = Ne,Ar,Kr, and Xe) were computed using Monte Carlo quasiclassical trajectories. The influence of vibrational and rotational excitation of the dissociation cross sections and rate coefficients was investigated for Ar+Ar/sub 2/. The following conclusions are reached. At high collision energies the cross section for dissociation of ground-state dimers is given by ..pi..R/sup 2//sub e/ (where R/sub e/ is the equilibrium internuclear separation of the dimer). Initial vibrational excitation greatly enhances dissociation; initial rotation also enhances dissociation but not to the extent that vibration does. The temperature dependence of the rate coefficients for dissociation of ground-state dimers is shown to be well described by k = CT/sup -1/3/. The rate of Ar/sub 2/ dissociation by Ar is found to be orders of magnitude greater than previously reported values.

• Research Organization: Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 5840104
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 76:4; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
CROSS SECTIONS
DIMERS
DISSOCIATION
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLUIDS
GASES
KINETICS
KRYPTON
MOLECULE COLLISIONS
NEON
NONMETALS
RARE GASES
ROTATIONAL STATES
TEMPERATURE DEPENDENCE
VIBRATIONAL STATES
XENON