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arXiv · 1206.5398

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

Akihiko Ikeda·Masuaki Matsumoto·Shohei Ogura·Katsuyuki Fukutani·Tatsuo Okano
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Abstract

Photo-stimulated 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 non-thermal 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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Akihiko Ikeda, Masuaki Matsumoto, Shohei Ogura, Katsuyuki Fukutani, Tatsuo Okano. 2012-06-23. Photostimulated desorption of Xe from Au(001) surfaces via transient Xe- formation. https://doi.org/10.1103/physrevb.84.155412

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