Very strong influence of surface imperfections on photodesorption of ions in the valence region: CO on Ru(001)

P. Feulner, S. Auer, W. Riedl, A. Cassuto, D. Menzel

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Abstract

In the course of an investigation of photon stimulated desorption of ions and neutrals from the adsorption system CO Ru(001), a very strong influence of surface imperfections on the intensity, as well as on the dependence on photon energy and polarization, of O+ desorption has been observed. At the crystal rim and around scratches, the ion intensity increased by up to more than threefold, the polarization dependence disappeared and the energy dependence changed drastically, compared to the flat, well-ordered crystal regions. The data agreed now with the previously published curve. The effect is explained in terms of selective enhancement of the ion survival probabilities by disorder-induced localization of the electronic excitation.

Original languageEnglish
Pages (from-to)L221-L225
JournalSurface Science
Volume182
Issue number1-2
DOIs
StatePublished - 3 Mar 1987

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