Fluorescence Spectrum and Relaxation Time Measurement of Cs2UO2Br4

Abstract
Fluorescence spectra of Cs2UO2Br4 were studied at 14, 4.2, and 1.4°K. Raman spectrum and relaxation times were also measured. At low temperatures, the fluorescence spectra showed additional lines which had highly temperature‐dependent relative intensities. These lines are thought of as originating from dislocations of the uranyl complex. The problem of parity of the first excited electronic state of the uranyl ion is also discussed.