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- W1979628497 abstract "Femtosecond time-resolved two-photon photoemission is used to study the influence of physisorbed xenon and oxygen adlayers on the lifetime of image potential states and interfacial quantum well states on Cu(111). Adsorption of 0 to 3 layers of Xe leads to a pronounced increase of the n equals 1 image state lifetime from 22 fs to 300 fs, respectively. However, for adsorbate heterostructures consisting of one monolayer (ML) O<SUB>2</SUB> on top of Xe spacer layers with variable thickness it is found that the lifetime of an oxygen induced quantum well state (0.35 eV below E<SUB>vac</SUB>) decreases from 650 fs to 90 fs when the number of spacer layers is raised from 1 ML to 5 ML. The results can be semiquantitatively reproduced by a model calculation which accounts for the modified image potential due to the Xe and O<SUB>2</SUB> adlayers. The changes of the lifetimes are explained by the differences in the penetration of the excited state wave function into the Cu substrate." @default.
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- W1979628497 date "1998-04-30" @default.
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- W1979628497 title "<title>Controlled modification of surface state lifetimes by physisorbed adsorbates</title>" @default.
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- W1979628497 doi "https://doi.org/10.1117/12.307125" @default.
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