Band-to-band Transitions and Critical Points in the Near-infrared to Vacuum Ultraviolet Dielectric Functions of Single Crystal Urania and Thoria
Document Type
Article
Publication Date
5-2019
Abstract
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 2.1 eV and 5.4 eV for UO2 and ThO2, respectively.
Source Publication
Applied Physics Letters
Recommended Citation
Mock, A., Dugan, C., Knight, S., Korlacki, R., Mann, J. M., Kimani, M. M., Petrosky, J. C., Dowben, P. A., & Schubert, M. (2019). Band-to-band transitions and critical points in the near-infrared to vacuum ultraviolet dielectric functions of single crystal urania and thoria. Applied Physics Letters, 114(21), 211901. https://doi.org/10.1063/1.5087059
Comments
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Funding notes: This work was supported in part by the National Science Foundation under Award No. DMR 1420645 (Nebraska Materials Research Science and Engineering Center) and under Award No. DMR 1808715. This work was supported in part by the Air Force Office of Scientific Research under Award No. FA9550-18-1-0360, the Defense Threat Reduction Agency (Grant No. HDTRA1-14-1-0041), and the Domestic Nuclear Detection Office of the Department of Homeland Security (Grant No. HSHQDC14X00089).