title: Hydrogen bonding in liquid water probed by resonant Auger-electron spectroscopy.
abstract: We have measured resonant and off-resonant Auger-electron spectra of liquid water. Continuumlike transitions near and above the O1s vertical ionization energy are identified by the characteristic normal Auger-electron spectra. On the contrary, well-resolved spectator shifts of the main Auger-electron peak are observed at the liquid-water O1s absorption main edge and near the absorption pre-edge. The shifts of 1.4 and 1.9 eV arise from the localized nature of the excitation. Excited-state localization/delocalization is also discussed for the analogous vacuum ultraviolet (VUV) transitions, and we point out the similarities between x-ray and VUV absorption spectra of liquid water.
authors.affiliation: Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2A, D-12489 Berlin, Germany. bwinter@mbi-berlin.de
authors.forename: Bernd
authors.initials: B
authors.lastname: Winter
authors.forename: Uwe
authors.initials: U
authors.lastname: Hergenhahn
authors.forename: Manfred
authors.initials: M
authors.lastname: Faubel
authors.forename: Olle
authors.initials: O
authors.lastname: Björneholm
authors.forename: Ingolf V
authors.initials: IV
authors.lastname: Hertel
mesh_terms: D004583:Electrons; D006859:Hydrogen / Q000737:chemistry*; D006860:Hydrogen Bonding; D015336:Molecular Probe Techniques; D012996:Solutions; D013057:Spectrum Analysis / Q000379:methods*; D020349:Surface Plasmon Resonance / Q000379:methods*; D014867:Water / Q000737:chemistry*