Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)
O 14.66: Poster
Montag, 27. März 2006, 18:00–21:00, P2
Photoemission Studies of Liquid Water and Aqueous Acid and Base Solutions — •Bernd Winter1, Manfred Faubel2, Ingolf V. Hertel1, Christian Pettenkofer3, Stephen E. Bradforth4, and Pavel Jungwirth5 — 1Max-Born-Institut, Berlin — 2MPI für Dynamik und Selbstorganisation, Göttingen — 3Hahn-Meitner-Institut, Berlin — 4University of Southern California, Los Angeles — 5Academy of Sciences, Prague
The electronic structure of liquid aqueous solutions is probed in a water jet by photoemission (PE) spectroscopy employing 100-1200 eV photons. The O1s PE spectra of liquid water exhibit minor differences for surface vs bulk water. Also in solute water, measured in aqueous alkali halide solutions, the O1s shift is no larger than 0.2 eV. The Auger spectrum of liquid water is nearly identical with previous reports for water clusters (Oehrwall et al., JCP 123, 054310, 2005). Strong well-resolved spectator Auger shifts, on the order of 3 eV, for resonant excitation, would appear to correlate with different H2O local structures. From valence PE studies of aqueous NaOH and HCl solutions the spectral signature of the lowest IP of OH- at 9.2 eV and of the second lowest IP of H3O+ at 20 eV are obtained. Both values agree with our ab initio and molecular dynamics calculations; the observed IP of hydronium is strongly supportive for an Eigen rather than a Zundel-like core.