Measuring the inverted region of an electron transfer reaction with a scanning tunneling microscope

Wolfgang Schmickler, Nongjian Tao

Research output: Contribution to journalArticle

67 Scopus citations

Abstract

A procedure to measure the inverted region of an electron-transfer reaction with a tunneling microscope is presented. A Fe(III)-protoporphyrin film adsorbed on a highly oriented pyrolytic electrode was chosen as a particularly suitable system. Experimental results indicate a strong decrease of the rate constant in the inverted region, and an approximately Gaussian density of states of the redox couple. The concomitant energy of reorganization is relatively small, of the order of 0.2 eV. Theoretical considerations show that inelastic tunneling transition would give rise to additional structure in the apparent density of states, but there is no evidence for this in the experimental data.

Original languageEnglish (US)
Pages (from-to)2809-2815
Number of pages7
JournalElectrochimica Acta
Volume42
Issue number18
DOIs
StatePublished - Jan 1 1997
Externally publishedYes

Keywords

  • Density of states
  • Electron transfer
  • Electron tunneling
  • Scanning tunneling microscope

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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