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Band-to-band transitions and critical points in the near-infrared to vacuum ultraviolet dielectric functions of single crystal urania and thoria
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering. Univ Nebraska, NE 68588 USA.
US Air Force, OH 45433 USA.
Univ Nebraska, NE 68588 USA.
Univ Nebraska, NE 68588 USA.
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2019 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 114, no 21, article id 211901Article in journal (Refereed) Published
Abstract [en]

Band-to-band transition energy parameters for single-crystal actinide samples of uranium oxide and thorium oxide were determined and compared using spectroscopic ellipsometry and critical-point dielectric function analyses. Spectroscopic ellipsometry measurements from the near-infrared to the vacuum ultraviolet spectral region were used to determine the dielectric functions of uranium oxide and thorium oxide. The critical-point structure is similar between UO2 and ThO2 but strongly blue shifted for ThO2. We find bandgap energies of 2.1eV and 5.4eV for UO2 and ThO2, respectively.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2019. Vol. 114, no 21, article id 211901
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-160180DOI: 10.1063/1.5087059ISI: 000482438000004OAI: oai:DiVA.org:liu-160180DiVA, id: diva2:1349558
Note

Funding Agencies|National Science Foundation [DMR 1420645, DMR 1808715]; Air Force Office of Scientific Research [FA9550-18-1-0360]; Defense Threat Reduction Agency [HDTRA1-14-1-0041]; Domestic Nuclear Detection Office of the Department of Homeland Security [HSHQDC14X00089]; Center for Thermal Energy Transport under Irradiation, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences; J. A. Woollam Foundation

Available from: 2019-09-09 Created: 2019-09-09 Last updated: 2019-09-09

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