Hydrogen bonding in liquid water probed by resonant Auger-electron spectroscopy.
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.
Winter
Bernd
B
Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2A, D-12489 Berlin, Germany. bwinter@mbi-berlin.de
Hergenhahn
Uwe
U
Faubel
Manfred
M
Björneholm
Olle
O
Hertel
Ingolf V
IV
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*