| Abstract
| - The photoinduced charge transfer that had been suggested to result in the dissociation of phenol on Ag(111)was investigated by two-photon photoemission spectroscopy. An unoccupied intermediate state was positivelyidentified, which was found to be located 3.22 eV above the Fermi level. From the photoelectron energydispersion, the effective mass of the intermediate state was determined to be (15 ± 10)me for a 1 ML coverageof phenol. This implies that the excited electron is localized mainly on the adsorbed phenol, forming a molecularresonance state. Polarization dependence of the photoelectron intensity suggested that the initial photoexcitationof the substrate produces hot electrons that scatter into the molecular resonance state, leading ultimately tothe dissociation of the adsorbate. These results are the first two-photon photoemission study to characterizethe transient anionic state involved in photodissociation of a molecule adsorbed on a metal surface.
|
