Calculation of partial widths and isotope effects for reactive resonances by a reaction-path Hamiltonian model: Test against accurate quantal results for a twin-saddle point system

Journal Article · Sun Apr 15 04:00:00 EST 1984 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.447176· OSTI ID:6858150

Skodje, R T; Schwenke, D W; Truhlar, D G; Garrett, B C

We calculate the partial widths of three collisional resonances in a collinear system with mass combinations HFH and DFD on a low-barrier model potential energy surface. We compare accurate quantal results to results obtained with a reaction-path Hamiltonian model in which the resonances are interpreted as quasibound states trapped in wells of adiabatic potential curves and their decay probabilities are calculated by semiclassical tunneling calculations and a Feshbach golden-rule formula with the decay mediated by an internal centrifugal interaction proportional to the curvature of the reaction path. The model successfully predicts when vibrationally nonadiabatic decay dominates over the adiabatic mechanism for decomposition of the resonances and it predicts the nonadiabatic partial widths with an average error of 25%.

• Research Organization: Department of Chemistry and Chemical Physics Program, University of Minnesota, Minneapolis, Minnesota 55455
• OSTI ID: 6858150
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 80:8; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
BOUND STATE
CHEMICAL REACTIONS
COLLISIONS
DEUTERIUM
ELEMENTS
HYDROFLUORIC ACID
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INELASTIC SCATTERING
INORGANIC ACIDS
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RESONANCE SCATTERING
SCATTERING
STABLE ISOTOPES