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- W2092228521 abstract "It is demonstrated that the dependence of the two-photon photoemission (2PPE) yield on the polarization of the exciting laser light provides detailed information about the excitation mechanism and the orientation of transition dipole moments in the 2PPE process. In particular, it is possible to distinguish between a direct two-photon excitation process, where both electronic transitions are induced by the electric fields at the surface, and an indirect mechanism, where the first excitation step occurs in the substrate. In the latter process the intermediate state in 2PPE is populated by scattering of photoexcited hot electrons from the substrate, which are subsequently photoemitted by the second laser pulse. The analysis is applied to 2PPE from clean and CO covered Cu(111). Furthermore, we have derived analytical expressions for the 2PPE signal based on the optical Bloch equations for a three-level system excited with continuous light beams. They allow us to calculate 2PPE spectra of surface states for a variety of cases." @default.
- W2092228521 created "2016-06-24" @default.
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- W2092228521 date "1999-02-15" @default.
- W2092228521 modified "2023-10-16" @default.
- W2092228521 title "Direct and indirect excitation mechanisms in two-photon photoemission spectroscopy of Cu(111) and CO/Cu(111)" @default.
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- W2092228521 doi "https://doi.org/10.1103/physrevb.59.5926" @default.
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