Photostimulated desorption of Xe from Au(001) surfaces via transient Xe formation

Akihiko Ikeda, Masuaki Matsumoto, Shohei Ogura, Katsuyuki Fukutani, and Tatsuo Okano
Phys. Rev. B 84, 155412 – Published 11 October 2011

Abstract

Photostimulated desorption (PSD) of Xe atoms from the Au(001) surface in thermal and nonthermal regimes was investigated by the time-of-flight measurement at photon energies of 6.4 and 2.3 eV. Xe was desorbed in a thermal way at high laser fluence, which was in good agreement with theoretical simulations. At a low laser fluence, on the other hand, desorption was induced only at a photon energy of 6.4 eV by a nonthermal one-photon process. We argue that the nonthermal PSD occurs via transient formation of Xe on Au(001). The lifetime of Xe is estimated to be 15 fs with a classical model calculation. Whereas the electron affinity of Xe is negative in the isolated state, it is stabilized by the metal proximity effect.

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  • Received 5 August 2011

DOI:https://doi.org/10.1103/PhysRevB.84.155412

©2011 American Physical Society

Authors & Affiliations

Akihiko Ikeda*, Masuaki Matsumoto, Shohei Ogura, Katsuyuki Fukutani, and Tatsuo Okano

  • Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8505, Japan

  • *a-ikeda@iis.u-tokyo.ac.jp
  • fukutani@iis.u-tokyo.ac.jp
  • okano@iis.u-tokyo.ac.jp

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Issue

Vol. 84, Iss. 15 — 15 October 2011

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