Erlangen 2018 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 20: Resonant Energy Transfer and Interatomic Coulombic Decay I
MO 20.5: Vortrag
Donnerstag, 8. März 2018, 15:15–15:30, PA 1.150
Ultrafast proton migration in water and ice — •Clemens Richter1, Clara Saak2, Melanie Mucke2, Isaak Unger2, Minna Patanen3, Torsten Leitner4, Ieva Bidermane4, Caspar Lant1,4,5, Olle Björneholm2, and Uwe Hergenhahn1,6 — 1Leibniz-Institut für Oberflächenmodifizierung, Leipzig — 2Uppsala University, Sweden — 3University of Oulu, Finland — 4Helmholtz-Zentrum Berlin — 5New York University, NY USA — 6Max-Planck-Institut für Plasmaphysik, Greifswald
Inner-shell ionization of water leads not only to a K-shell decay, but also to a substantial nuclear rearrangement. A spectral signature for ultrafast proton transfer has been seen in Auger and X-Ray spectra of liquid water. Detailed theoretical modelling has revealed the role of Intermolecular Coulombic Decay (ICD) and Electron Transfer Mediated Decay (ETMD) in these spectra. An analogous feature we now have observed in KVV Auger spectra of amorphous ice. To minimize charging and radiation damage, we have employed an angle-resolving time-of-flight spectrometer offering a large collection angle for electrons together with good energy resolution at Auger kinetic energies.
In a second set of experiments, we intended to use the proton transfer signature (‘proton transfer mediated charge separation’, PTMCS) as a monitor for hydrogen bond strength in a variety of systems. Towards this end, we have recorded the K-shell autoionization spectra of water clusters in comparison with methanol clusters, which are known to have a less strong hydrogen network. Several cluster sizes were probed. Differences between the two species will be discussed.