Irreversible energy transfer in ionization of physisorbed adsorbates. Aničić, A. & Gumhalter, B. Surface Science, 269-270(5A):438-443, 1992. ![Irreversible energy transfer in ionization of physisorbed adsorbates [link]](https://bibbase.org/img/filetypes/link.svg "link")
Website abstract bibtex When a physisorbed adsorbate is core ionized by an external probe (electron impact or photon absorption), its interaction with the substrate drastically changes due to different local charge density equilibria in the initial (neutral) and final (ionized) states. Upon ionization the initial state adatom-surface diabatic potential V0(z), characteristic of physisorption, is succeeded by a diabatic potential V+(z) with a long-range image tail and a much deeper minimum shifted towards the surface z = 0. The ionization of the adatom or the Franck-Condon diabatic transition of V0(z) → V+(z), in which the suddenly created ion charge couples strongly to the substrate surface electronic response, gives rise to inelastic transfer of energy from the probe and the adatom to the charge density fluctuations in the substrate. In this work we study the probability of inelastic events, the overall energy transfer subsequent to the diabatic transition, the amount of energy irreversibly transferred to the substrate and the amount lost by the adatom, as functions of the adsorbate mass and other parameters characteristic of the system. This is applied to analyze the role and efficiecy of inelastic effects in Antoniewicz's mechanism of electron stimulated desorption of Ar from Ag surfaces.
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abstract = {When a physisorbed adsorbate is core ionized by an external probe (electron impact or photon absorption), its interaction with the substrate drastically changes due to different local charge density equilibria in the initial (neutral) and final (ionized) states. Upon ionization the initial state adatom-surface diabatic potential V0(z), characteristic of physisorption, is succeeded by a diabatic potential V+(z) with a long-range image tail and a much deeper minimum shifted towards the surface z = 0. The ionization of the adatom or the Franck-Condon diabatic transition of V0(z) → V+(z), in which the suddenly created ion charge couples strongly to the substrate surface electronic response, gives rise to inelastic transfer of energy from the probe and the adatom to the charge density fluctuations in the substrate. In this work we study the probability of inelastic events, the overall energy transfer subsequent to the diabatic transition, the amount of energy irreversibly transferred to the substrate and the amount lost by the adatom, as functions of the adsorbate mass and other parameters characteristic of the system. This is applied to analyze the role and efficiecy of inelastic effects in Antoniewicz's mechanism of electron stimulated desorption of Ar from Ag surfaces.},
bibtype = {article},
author = {Aničić, A and Gumhalter, Branko},
journal = {Surface Science},
number = {5A}
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