SPECTROSCOPIC INVESTIGATION OF URANIUM OXIDES ISOLATED IN SOLID Ar
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Date
2006
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Ohio State University
Abstract
Laser-induced fluorescence spectra and infra-red absorptions have been recorded for matrix-isolated uranium oxides. Uranium oxide species were obtained by laser vaporization of a uranium metal target into a flow of Ar that contained a trace of O${_2}$ (0.1\%). Pulsed laser excitation was examined using the harmonics from an Nd/YAG laser (266 and 355 nm), an XeCl excimer laser (308 nm) and a dye laser operating in the 400-550 nm range. Several absorption and emission band systems were observed. The emission spectra were dominated by a nearly harmonic vibrational progression with a frequency of 850 cm$^{-1}$. In situ photolysis experiments indicate that UO${_3}$ produces the observed fluorescence. Assignment of the electronic transitions of UO${_3}$ is discussed in terms of the electronic structure of the 6 + oxidation state of uranium.
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Author Institution: Department of Chemistry, Emory University, Atlanta, GA 30322