Spin--orbit coupling and inelastic transitions in collisions of O(/sup 1/D) with Ar, Kr, and Xe

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · J. Chem. Phys.; (United States)

OSTI ID:5964709

Cohen, J S; Wadt, W R; Hay, P J

Inelastic collisions of O(/sup 1/D) with Ar, Kr, and Xe have been treated in the multistate Landau--Zener and the close-coupling approximations. The coupling mechanism is spin--orbit mixing. The dependence of the spin--orbit matrix elements on internuclear distance R is calculated using accurate configuration--interaction wave functions and an effective operator composed of one-electron, one-center terms. The R dependence is found to be very significant. Cross sections for transitions to the individual triplet fine-structure levels, as well as the total inelastic (quenching) cross section, are presented as a function of collision energy. The transitions occur primarily at curve crossings and the quenching rate constants were found to be significantly reduced by centrifugal barriers outside the crossing points. The calculated quenching rate constants at 300 K are (5.4 +- 3.5) x 10/sup -13/, (6.0 +- 0.7) x 10/sup -12/, and (3.0 +- 0.2) x 10/sup -11/ cm/sup 3/ molecule/sup -1/ s/sup -1/ for Ar, Kr, and Xe, respectively.

• Research Organization: Theoretical Division, Los Alamos Scientific Laboratory, University of California, Los Alamos, New Mexico 87545
• OSTI ID: 5964709
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 71:7; 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-ATOM COLLISIONS
COLLISIONS
COUPLING
CRYOGENIC FLUIDS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
FLUIDS
INTERMEDIATE COUPLING
KRYPTON
L-S COUPLING
MATRIX ELEMENTS
NONMETALS
OXYGEN
RARE GASES
XENON