We have investigated the lifetimes of image-potential states on the Pt(111) surface with time-resolved two-photon photoemission and first-principles calculations. Electrons populating the first two image-potential states decay into bulk states after 26±7 and 62±7 fs, respectively. This is in agreement with results of theoretical calculations. Oxygen adsorption reduces the image-potential state lifetimes by a factor of 2. This is caused by a strong change of the electronic structure near the Fermi level.
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Link et al. (2001) studied this question.
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