Electronic excitations of adsorbates analyzed with two-photon photoemission: 
COCu(1 1 1)

Hertel, Tobias; Knoesel, Ernst; Ertl, Gerhard

doi:10.1016/0168-583X(95)00057-7

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Electronic excitations of adsorbates analyzed with two-photon photoemission: COCu(1 1 1)

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Hertel, Tobias
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Knoesel, Ernst
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl, Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Zitation

Hertel, T., Knoesel, E., & Ertl, G. (1995). Electronic excitations of adsorbates analyzed with two-photon photoemission: COCu(1 1 1). Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 101(1-2), 53-55. doi:10.1016/0168-583X(95)00057-7.

Zitierlink: https://hdl.handle.net/21.11116/0000-000E-7127-7

Zusammenfassung

Photoinduced excitations of normally unoccupied electronic states of adsorbates are investigated with two-photon photoemission (2PPE). We report 2PPE spectra from an ordered (1.4 × 1.4)-CO layer on Cu(1 1 1) for excitation with 3.5 eV ≤ hv ≤ 4.5 eV photon energy. The energetic position, Ekin, of a CO induced state is found to shift as ΔE_kin = 1 × Δhv. This provides evidence for emission from a normally unoccupied state, located (3.3 ± 0.2) eV above the Fermi level. Based on the polarization dependence of the emission from this adsorbate-induced state it is identified as the 2π* affinity level of chemisorbed CO on Cu(1 1 1) which is temporarily populated in the 2PPE process.