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Interfacial charge-transfer absorption: semiclassical treatment.

Carol Creutz1, Bruce S Brunschwig, Norman Sutin

  • 1Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA. ccreutz@bnl.gov

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary
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Interfacial charge-transfer absorption (IFCTA) models predict new electronic features. This study provides a framework for modeling IFCTA spectra, offering insights into interfacial charge-transfer kinetics.

Area of Science:

  • Physical Chemistry
  • Surface Science
  • Spectroscopy

Background:

  • Optically induced charge transfer between adsorbates and electrodes was theoretically predicted but not observed.
  • Previous work characterized photocurrents from metal atoms on semiconductor conduction bands.

Purpose of the Study:

  • To develop a framework for modeling and predicting interfacial charge-transfer absorption (IFCTA) spectra.
  • To understand the factors influencing IFCTA, including electronic coupling and energy barriers.

Main Methods:

  • Theoretical modeling of optical charge transfer to/from a band of electronic levels.
  • Analysis of absorption probability based on reorganization energy and free-energy gap.
  • Comparison with the Mulliken-Hush model for electronic coupling.

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Main Results:

  • IFCTA spectra exhibit characteristic features dependent on reorganization energy, free-energy gap, and temperature.
  • The Mulliken-Hush model predicts a peaked, asymmetric absorption profile.
  • Weak electronic coupling generally leads to undetectable absorption on metal surfaces.

Conclusions:

  • IFCTA provides valuable information on interfacial charge-transfer barriers and electronic coupling.
  • Modeling IFCTA is crucial for understanding interfacial charge-transfer kinetics.
  • Intense IFCTA features may occur for semiconductors due to coupling with surface states.