Band-to-band transitions and critical points in the near-infrared to vacuum ultraviolet dielectric functions of single crystal urania and thoria
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 27, 2019
- Source ID
- 10.1063/1.5087059
Entities
People
- Alyssa Mock
- Christina Dugan
- J. A. Woollam
- J. Matthew Mann
- James C. Petrosky
- Martin M. Kimani
- Mathias Schubert
- Peter A Dowben
- Rafał Korlacki
- Sean Knight
Organizations
- Air Force Institute of Technology
- Air Force Office of Scientific Research
- Air Force Research Laboratory
- Defense Threat Reduction Agency
- Leibniz Institute for Polymer Research
- Linköping University
- National Science Foundation
- United States Department of Energy
- United States Department of Homeland Security
- University of Nebraska–Lincoln