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Atom-specific activation in CO oxidation
Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden..
Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden..
Chapman Univ, Schmid Coll Sci & Technol, Orange, CA 92866 USA..
SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA..
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2018 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 149, no 23, article id 234707Article in journal (Refereed) Published
Abstract [en]

We report on atom-specific activation of CO oxidation on Ru(0001) via resonant X-ray excitation. We show that resonant 1s core-level excitation of atomically adsorbed oxygen in the co-adsorbed phase of CO and oxygen directly drives CO oxidation. We separate this direct resonant channel from indirectly driven oxidation via X-ray induced substrate heating. Based on density functional theory calculations, we identify the valence-excited state created by the Auger decay as the driving electronic state for direct CO oxidation. We utilized the fresh-slice multi-pulse mode at the Linac Coherent Light Source that provided time-overlapped and 30 fs delayed pairs of soft X-ray pulses and discuss the prospects of femtosecond X-ray pump X-ray spectroscopy probe, as well as X-ray two-pulse correlation measurements for fundamental investigations of chemical reactions via selective X-ray excitation. Published by AIP Publishing.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2018. Vol. 149, no 23, article id 234707
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Physical Sciences
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URN: urn:nbn:se:kth:diva-240994DOI: 10.1063/1.5044579ISI: 000454102600024PubMedID: 30579301Scopus ID: 2-s2.0-85058910562OAI: oai:DiVA.org:kth-240994DiVA, id: diva2:1276837
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QC 20190109

Available from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-08-20Bibliographically approved

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Sellberg, Jonas A.

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