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Surface interaction of PuO.sub.2./sub., UO.sub.2+x./sub. and UO.sub.3./sub. with water ice
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SYSNO ASEP 0422399 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Surface interaction of PuO2, UO2+x and UO3 with water ice Tvůrce(i) Gouder, T. (DE)
Shick, Alexander (FZU-D) RID, ORCID
Huber, F. (DE)Zdroj.dok. Topics in Catalysis. - : Springer - ISSN 1022-5528
Roč. 56, č. 12 (2013), s. 1112-1120Poč.str. 9 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova photoemission ; catalysis ; surface oxidation Vědní obor RIV CF - Fyzikální chemie a teoretická chemie Institucionální podpora FZU-D - RVO:68378271 UT WOS 000323100900010 EID SCOPUS 84883539650 DOI 10.1007/s11244-013-0077-3 Anotace The interaction of PuO2, UO2+x and UO3 with water ice was studied using ultraviolet photoelectron spectroscopy (UPS). Water was adsorbed at 80-120 K as thick ice multilayers. Surface modification after desorption of the ice around 200 K was investigated. Main information on the surface oxidation state was obtained by highly surface sensitive UPS-HeII spectra, probing primarily the first monolayer. The oxidation state was directly deduced from the intensity of the actinide 5f levels. The surface character of the phenomenon was further confirmed by comparing HeII spectra with the more bulk sensitive HeI spectra. Spectral interpretation was done using the cross-section variations in HeI and HeII spectra and by comparing the spectra with theoretical density of states curves, obtained by LSDA + U calculations. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2014
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