Tunneling time for electron transfer reactions

Abraham Nitzan*, Joshua Jortner, Joshua Wilkie, Alexander L. Burin, Mark A. Ratner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The tunneling time for nonadiabatic electron transfer reactions described within the superexchange model is estimated using a Biittiker type internal clock: the electron is taken to possess two internal spin states that are weakly coupled on the bridge. By studying the transition probability between these channels during the tunneling process the traversal time through the bridge can be estimated. Like the Büttiker-Landauer result it is linear in the bridge length, but its dependence on the barrier energy UB approaches the Büttiker-Landauer form only in the limit of strong interstate coupling (broad band). In the "normal" superexchange (weak coupling) limit it is inversely proportional to the barrier energy.

Original languageEnglish
Pages (from-to)5661-5665
Number of pages5
JournalJournal of Physical Chemistry B
Issue number24
StatePublished - 22 Jun 2000


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