A Model Calculation for Photo-Stimulated Desorption

Hiroki Tsuchiura, Hideaki Kasai, Ayao Okiji

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

A model calculation is presented for photo-stimulated desorption of adsorbates from a metal surface. In the model, the electron system of the material is described by a two-band tight-binding Hamiltonian. Interband electronic excitation is induced by laser pulse irradiation and causes a change in adsorbate trajectory. Close investigations are made of the dependence of the adsorbate trajectory on the photon energy and the time-width of laser pulse within one-photon process. For that purpose, an effective excited-state potential for adsorbate motion is introduced tentatively. When the electronic excitation is spatially localized in the neighborhood of the surface, substantial deviation of shape from the ground state potential can be seen in the effective excited-state potential, and gives rise to adsorbate desorption. It can be expected from the obtained results that the desorption probability increases as the photon energy is increased and as the time-width of laser pulse is decreased.

Original languageEnglish
Pages (from-to)2805-2810
Number of pages6
JournalJournal of the Physical Society of Japan
Volume66
Issue number9
DOIs
Publication statusPublished - 1997 Jan 1
Externally publishedYes

Keywords

  • Adsorbate
  • DIET
  • Metal surface
  • One-photon process
  • Photo-stimulated desorption
  • Surface dynamical process
  • Ultra-short laser pulse

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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