A Model Calculation for Photo-Stimulated Desorption
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概要
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A tnodel calculation is presented for photo-stimulated desorption of adsorbates from a tnetalsurface. In the model, the electron systean of the tnaterial is described by a two-band tight-binding Hazniltonian. Interband electronuc excitation is induced by laser pulse irradiation andcauses a change in adsorbate tra.jectory. Close investigations are made of the dependence ofthe adsorbate trajectory on the photon energy and the time-width of laser pulse within one-photon process. For that ptrrpose, an efl'ective excited-state potential for adsorbate motion isintroduced tentatively. When the electronic excitatioza is spatially localized in the neighborhoodof the stnrface, substantial deviation of shape f'rom the ground state potential can be seen in theeffective excited-state potential, and gives rise to adsorbate desorption. It can be expected fromthe obtained results that the desorption probability increases as the photon energy is incretrsedand as the time-width of laser pulse is decreased.
- 社団法人日本物理学会の論文
- 1997-09-15
著者
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KASAI Hideaki
Department of Precision Science and Technology and Applied Physics, Osaka University
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Okiji Ayao
Department Of Applied Physics Osaka University
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Okiji Ayao
Department Of Aplied Physics Faculty Of Engineering Osaka University
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Tsuchiura Hiroki
Department of Applied Physics,Osaka University
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Tsuchiura Hiroki
Department Of Applied Physics Osaka University
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Kasai Hideaki
Department Of Applied Physics Faculty Of Engineering Osaka University
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Tsuchiura Hiroki
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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