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Negative-electron-affinity diamondoid monolayers as high-brilliance source for ultrashort electron pulses


Roth, S; Leuenberger, D; Osterwalder, J; Dahl, J E; Carlson, R M K; Tkachenko, B A; Fokin, A A; Schreiner, P R; Hengsberger, M (2010). Negative-electron-affinity diamondoid monolayers as high-brilliance source for ultrashort electron pulses. Chemical Physics Letters, 495(1-3):102-108.

Abstract

Diamondoids are nanometer-sized, hydrogen terminated diamond-like molecules consisting of fused adamantane units. The thiolated diamondoid [121]tetramantane-6-thiol shows negative electron affinity behavior, i.e. population of unoccupied states directly leads to spontaneous electron emission. We present time-resolved photoemission data from self-assembled monolayers of [121]tetramantane-6-thiol in order to shed light on the emission process: A photon energy threshold for electron emission of 5.6–5.8 eV was observed, and the electron affinity was estimated to be −0.21 to −0.57 eV for Ag and Au substrates, respectively. Electrons are emitted after excitation in the metal substrate through the molecular orbitals within a few femtoseconds.

Abstract

Diamondoids are nanometer-sized, hydrogen terminated diamond-like molecules consisting of fused adamantane units. The thiolated diamondoid [121]tetramantane-6-thiol shows negative electron affinity behavior, i.e. population of unoccupied states directly leads to spontaneous electron emission. We present time-resolved photoemission data from self-assembled monolayers of [121]tetramantane-6-thiol in order to shed light on the emission process: A photon energy threshold for electron emission of 5.6–5.8 eV was observed, and the electron affinity was estimated to be −0.21 to −0.57 eV for Ag and Au substrates, respectively. Electrons are emitted after excitation in the metal substrate through the molecular orbitals within a few femtoseconds.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2010
Deposited On:16 Feb 2011 16:06
Last Modified:07 Dec 2017 07:21
Publisher:Elsevier
ISSN:0009-2614
Publisher DOI:https://doi.org/10.1016/j.cplett.2010.06.063

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