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Time resolved two‐photon photoemission, based on the equal pulse correlation technique, is used to measure the energy relaxation of the photoexcited electrons in various polycrystalline metal samples. While for Ag the inelastic lifetime of excited electrons is, within our time resolution, in agreement with the Fermi‐liquid theory, the result obtained for Au is very different. Scanning tunneling microscopy studies reveal that the enhanced inelastic lifetime of gold is not caused by surface effects. The measured inelastic relaxation time for transition metals with unoccupied d‐orbitals is shorter as compared to the noble metals, indicating that the inelastic decay depends on the number of unoccupied d‐orbitals below the probed energy state.
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Aeschlimann et al. (1995) studied this question.
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