OPTICAL PROPERTIES OF A MECHANICALLY POLISHED AND AIR-EQUILIBRATED [111] UO2 SURFACE BY RAMAN AND ELLIPSOMETRIC SPECTROSCOPY

Conference · Wed Jul 22 00:00:00 EDT 2009

OSTI ID:966563

Siekhaus, W J; Crowhurst, J C

Optical constants of a [111] UO{sub 2} surface, aged in air, were measured in the range from .8 and 5 eV using ellipsometric spectroscopy. The ellipsometric data acquired at angles of incidence of 65, 70 and 75 degrees have been fitted by two techniques: (1) First at low energies with a Cauchy-Urbach model extended by the point by point method to higher energies and shown to be Kramers-Kronig consistent, (2) by a Gauss-Lorentz and a Tauc Lorentz Oscillator. Both techniques lead to dielectric constants that differ at energies above 2 eV substantially from Schoenes for vacuum-annealed [111] UO{sub 2}. Raman spectra taken at 632 nm show no indication of hyper-stoichiometry.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 966563
• Report Number(s): LLNL-PROC-415099; TRN: US200921%%662
• Resource Relation: Conference: Presented at: Actinides 2009, San Francisco, CA, United States, Jul 12 - Jul 18, 2009
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTINIDES
AIR
OPTICAL PROPERTIES
PERMITTIVITY
RAMAN SPECTRA
SPECTROSCOPY