Electron tunneling in cytochrome c

Albert M. Chang, Robert H. Austin

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


An upper limit for the extinction coefficient of the charge transfer band in the ferrohexacyanide-ferricytochrome c redox couple has been determined from 800 to 1800 nm. We obtain ε≤0.003 M-1 cm-1 between 800-1400 nm, ε≤0.02 M-1 cm-1 between 1400-1800 nm. Prompt transfer of charge due to excitation in the heme absorption bands occurs with a quantum yield of approximately 10-4. Simple vibronically assisted tunneling theories and appropriate choice of highly localized wave functions have been used to show that tunneling theory can give a reasonable fit to all aspects of charge transfer between cytochrome c and iron hexacyanide, including the small value of the charge transfer band extinction coefficient.

Original languageEnglish (US)
Pages (from-to)5272-5283
Number of pages12
JournalThe Journal of chemical physics
Issue number11
StatePublished - 1982

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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