Electron transfer rates in bridged molecular systems: A phenomenological approach to relaxation

William B. Davis, Michael R Wasielewski, Mark A Ratner, Vladimiro Mujica, Abraham Nitzan

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177 Citations (Scopus)

Abstract

A model for bridge-assisted, long-range electron transfer in a molecule interacting with a dissipative external bath is presented. The effects of the system-bath interaction are included phenomenologically in the evolution of the system density matrix as energy dephasings on the bridge sites. When the bridge dephasings are small, the steady state ET rate in this model is found to be the sum of two competing terms; the first is a McConnell-type rate arising from direct tunneling from donor to acceptor, and the second is a dephasing-dependent, length-independent scattering channel through the bridge sites. In the limit of large dephasings, an incoherent channel dominates the dynamics and leads to ET rates that can become only weakly dependent (kET ∝ 1/N) on the number of bridge sites in the system, for multisite bridges.

Original languageEnglish
Pages (from-to)6158-6164
Number of pages7
JournalJournal of Physical Chemistry A
Volume101
Issue number35
Publication statusPublished - Aug 28 1997

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electron transfer
Electrons
baths
Scattering
Molecules
scattering
molecules
interactions
energy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Electron transfer rates in bridged molecular systems : A phenomenological approach to relaxation. / Davis, William B.; Wasielewski, Michael R; Ratner, Mark A; Mujica, Vladimiro; Nitzan, Abraham.

In: Journal of Physical Chemistry A, Vol. 101, No. 35, 28.08.1997, p. 6158-6164.

Research output: Contribution to journalArticle

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