Excited states in the alkali/noble metal surface systems: A model system for the study of charge transfer dynamics at surfaces |
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Affiliation: | 1. Laboratoire des Collisions Atomiques et Moléculaires, Unité Mixte de Recherche CNRS-Université Paris Sud UMR 8625, Bât 351, Université Paris-Sud, 91405 Orsay Cedex, France;2. Fachbereich Physik, TU Kaiserslautern, 67663 Kaiserslautern, Germany |
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Abstract: | The low coverage adsorption of alkalis on metal surfaces induces excited states localised on the adsorbate. In the case of noble metal substrates, these excited states can exhibit a very long lifetime, up to tens of fs in the Cs/Cu(1 1 1) system. We review recent experimental and theoretical investigations of alkalis adsorbed on noble metal surfaces, with emphasis on the characteristics of the alkali-induced excited states, the origin of their long lifetimes, and the consequences for the adsorbate dynamics. The possibility of long-lived resonances in other adsorbate/substrate systems is also discussed. |
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