A microscopic theory of desorption induced by electronic transitions

Hideaki Kasai, Ayao Okiji, Hiroki Tsuchiura

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Desorption induced by electronic transitions (DIET) in two cases is investigated from a microscopic point of view. In case A, where a single electron in a state of the localized kind (localized around adsorbates) is excited into a state of the extended kind (extended into the bosom of the substrate), the shape of the excited-state potential-energy surface (PES) may differ markedly from that of the ground-state PES for adsorbate motion. The Franck-Condon factor then takes a finite value, giving rise to a finite desorption probability. In case B, where a single electron in a state of the extended kind is excited into another state of the extended kind, the shape of the excited-state PES is practically the same as that of the ground-state PES. The Franck-Condon factor is then zero. In such a case, one should take DIET as a single-step (coherent) process and take into account the adsorbate-position dependence of the matrix element for state transitions of the electron system in order to obtain a finite desorption probability.

Original languageEnglish
Pages (from-to)214-222
Number of pages9
JournalSurface Science
Volume363
Issue number1-3
DOIs
Publication statusPublished - 1996 Aug 1

Keywords

  • Electron-stimulated desorption
  • Photon-stimulated desorption

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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