Electronic excitations in synthetic eumelanin aggregates probed by soft X-ray spectroscopies

J Phys Chem B. 2007 May 17;111(19):5372-6. doi: 10.1021/jp067415c. Epub 2007 Apr 20.

Abstract

Electronic excitations of condensed phase eumelanin aggregates are investigated with soft X-ray spectroscopies. Resonant photoemission data indicate that mechanisms of charge delocalization may occur when electrons are excited about 3 eV above the first unoccupied electronic level. An average, lower limit value of 1.6 fs was estimated for the lifetime of the excited C 1s-pi* states.

MeSH terms

  • Melanins / chemistry*
  • Molecular Structure
  • Spectrometry, X-Ray Emission / methods

Substances

  • Melanins
  • eumelanin