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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents



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ID: 433890.0, Fritz-Haber-Institut / Physical Chemistry
Solvation dynamics of surface-trapped electrons at NH3 and D2O crystallites adsorbed on metals: from femtosecond to minute timescales
Authors:Stähler, Julia; Meyer, Michael; Bovensiepen, Uwe; Wolf, Martin
Language:English
Date of Publication (YYYY-MM-DD):2011
Title of Journal:Chemical Science
Volume:2
Issue / Number:5
Start Page:907
End Page:916
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
External Publication Status:accepted
Document Type:Article
Communicated by:Martin Wolf
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Bovensiepen U, Meyer M, Freie Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany
Identifiers:URL:http://dx.doi.org/10.1039/c0sc00644k [only subscriber]
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