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  Solvation dynamics of surface-trapped electrons at NH3 and D2O crystallites adsorbed on metals: from femtosecond to minute timescales

Stähler, J., Meyer, M., Bovensiepen, U., & Wolf, M. (2011). Solvation dynamics of surface-trapped electrons at NH3 and D2O crystallites adsorbed on metals: from femtosecond to minute timescales. Chemical Science, 2(5), 907-916. doi:10.1039/c0sc00644k.

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 Creators:
Stähler, Julia1, 2, Author           
Meyer, Michael1, 2, Author           
Bovensiepen, Uwe2, 3, Author
Wolf, Martin1, 2, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany, ou_persistent22              
3Universität Duisburg-Essen, Fakultät für Physik, Lotharstr. 1, 47048 Duisburg, Germany, ou_persistent22              

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 Abstract: The creation and stabilization of localized, low-energy electrons is investigated in polar molecular environments. We create such excess electrons in excited states in ice and ammonia crystallites adsorbed on metal surfaces and observe their relaxation in real time using time-resolved photoelectron spectroscopy. The observed dynamics proceed up to minute timescales and are therefore slowed down considerably compared to ultrafast excited state relaxation in front of metal surfaces, which proceeds typically on femto- or picosecond time scales. It is the highly efficient wave function constriction of the electrons from the metal that ultimately enables the investigation of the relaxation dynamics over a large range of timescales (up to 17 orders of magnitude). Therefore, it gives novel insight into the solvated electron ground state formation at interfaces. As these long-lived electrons are observed for both, D2O and NH3 crystallites, they appear to be of general character for polar molecule–metal interfaces. Their time- and temperature-dependent relaxation is analyzed for both, crystalline ice and ammonia, and compared using an empirical model that yields insight into the fundamental solvation processes of the respective solvent.

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Language(s): eng - English
 Dates: 2010-12-232011-02-162011-02-16
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 433890
DOI: 10.1039/c0sc00644k
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Title: Chemical Science
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 2 (5) Sequence Number: - Start / End Page: 907 - 916 Identifier: ISSN: 2041-6520
CoNE: https://pure.mpg.de/cone/journals/resource/2041-6520