Adiabaticity and nonadiabaticity in bimolecular outer-sphere charge transfer reactions

Journal Article · Tue Nov 15 04:00:00 EST 1988 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.455436· OSTI ID:6774151

Beratan, D N; Onuchic, J N

A model for outer-sphere bimolecular electron transfer reactions is presented which is based on a rate expression correct in the adiabatic, nonadiabatic, and intermediate dynamical regimes for an overdamped solvent coordinate. A complete discussion of the time-scale separations needed to define a bimolecular rate for these electron transfer reactions is given. Bimolecular reaction rates are predicted to display distinct solvent and electronic coupling dependencies, defined by a few experimentally variable parameters, which we now identify. Also, a significant intermediate dynamical regime is predicted to exist in which the rate is sensitive to both electronic coupling and nuclear relaxation. Evidence that both extreme dynamical regimes have been accessed experimentally is recalled, and strategies are presented for fully mapping out the dependence of rate on the electronic coupling and relaxation times.

• Research Organization: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109
• OSTI ID: 6774151
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 89:10; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADIABATIC PROCESSES
CHARGE EXCHANGE
CHEMICAL REACTION KINETICS
COLLISIONS
ELECTRON TRANSFER
KINETICS
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
REACTION KINETICS
RELAXATION TIME