Berlin 2014 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 21: Photochemistry
MO 21.5: Vortrag
Freitag, 21. März 2014, 11:30–11:45, BEBEL HS213
Proton Transfer in Aqueous Solutions — •Isaak Unger1, Stephan Thürmer2, and Bernd Winter1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie — 2Center for Frontier Science, Chiba University, Japan
Synchrotron radiation has been used to core-excite several hydrogen-bonded species (Ammonia, Glycine) in aqueous solution using a liquid microjet as a sample. In contrast to gaseous samples, Auger decay is not the sole possible deexcitation channel in aqeous solutions. In the intermolecular Coulombic decay, the released energy upon a recombination of a valence electron with a core hole is transferred to a neighboring molecule releasing an electron. Auger electron spectroscopy of different aqueous solutions and thier deuterated equivalents show a considerable influence of the proton mass on the decay probability of such delocalized deexcitation processes. We propose a model of proton transfer assisted decay to explain the different decay behaviour of deuterated species in hydrogen-bonded systems.