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  Ultrafast electron dynamics at water covered alkali adatoms adsorbed on Cu(111)

Meyer, M., Agarwal, I., Wolf, M., & Bovensiepen, U. (2015). Ultrafast electron dynamics at water covered alkali adatoms adsorbed on Cu(111). Physical Chemistry Chemical Physics, 17(13), 8441-8448. doi:10.1039/C4CP05356G.

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 Creators:
Meyer, Michael1, 2, Author           
Agarwal, Ishita3, Author
Wolf, Martin1, 2, Author           
Bovensiepen, Uwe1, 3, Author
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1Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany, ou_persistent22              
2Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
3Fakultät für Physik und Zentrum für Nanointegration (CENIDE), Universität Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany, ou_persistent22              

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 Abstract: Here we report on the ultrafast electron dynamics of the alkalis Na, K, and Cs coadsorbed with D2O on Cu(111) surfaces, which we investigated with femtosecond time-resolved two-photon photoemission. The well known transient electronic binding energy stabilization in bare adsorbed alkalis is enhanced by the presence of water which acts as a solvent and increases the transient energy gain. We observe for all adsorbed alkalis a transient binding energy stabilization of 100–300 meV. The stabilization rates range from 1 to 2 eV ps-1. Here the heavier alkali exhibits a slower stabilization which we explain by their weaker static alkali–water interaction observed in thermal desorption spectroscopy. The population dynamics at low water coverage is described by a single exponential. With increasing water coverage the behavior becomes non-exponential suggesting an additional excited state due to electron solvation

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Language(s): eng - English
 Dates: 2014-11-182015-01-212015-01-232015-04-07
 Publication Status: Issued
 Pages: 8
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1039/C4CP05356G
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Title: Physical Chemistry Chemical Physics
  Abbreviation : Phys. Chem. Chem. Phys.
Source Genre: Journal
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Publ. Info: Cambridge, England : Royal Society of Chemistry
Pages: - Volume / Issue: 17 (13) Sequence Number: - Start / End Page: 8441 - 8448 Identifier: ISSN: 1463-9076
CoNE: https://pure.mpg.de/cone/journals/resource/954925272413_1