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Ultrafast Dynamics at the Na/D2O/Cu(111) Interface: Electron Solvation in Ice Layers and Na+-Mediated Surface Solvation

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Meyer,  Michael
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany;

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Wegkamp,  Daniel
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany;

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Krenz,  Marcel
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany;

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Citation

Meyer, M., Bertin, M., Bovensiepen, U., Wegkamp, D., Krenz, M., & Wolf, M. (2011). Ultrafast Dynamics at the Na/D2O/Cu(111) Interface: Electron Solvation in Ice Layers and Na+-Mediated Surface Solvation. The Journal of Physical Chemistry C, 115(1), 204-209. doi:10.1021/jp107253g.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-3F3A-9
Abstract
We have studied the influence of sodium ions bound near the ice/vacuum interface on the electron solvation dynamics in amorphous D2O ice layers by means of femtosecond time-resolved two-photon photoelectron spectroscopy. Adsorption of submonolayer coverages of sodium on top of multilayers of amorphous ice leads to the formation of Na+ ions and to pronounced changes in the observed ultrafast dynamics compared to pure amorphous ice. We identify a Na+-induced species of excess electrons which exhibits a much longer lifetime compared to excess electrons in pure D2O ice and approximate the decay of the Na-induced contribution by two decay times τ2 = 880 fs and τ3 = 9.6 ps. In addition, a faster energetic stabilization of the excited electrons with a rate of Σ = 0.73 eV/ps is observed. The population of these electrons depends nonlinearly on the sodium coverage. We attribute the Na-induced contribution to a transient electron/ion/water complex which is located at the ice/vacuum interface. This interpretation is corroborated by coverage-dependent measurements and by overlayer experiments.