Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 113, Issue 45, Pages 12724-12728Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp9052133
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Laser-induced fluorescence spectra have been recorded for uranyl chloride isolated in a solid At matrix Pulsed excitation was examined using a XeCl excimer laser (308 nm) and a dye laser operating in the 19 500-27 500 cm(-1) range. Several absorption and emission hand systems were observed The emission spectra were characterized by a nearly harmonic vibrational progression with a frequency of 840 cm(-1) starting at 20 313 cm(-1). The electronic absorption spectra were dominated by five hannonic vibrational progressions with frequencies of approximately 710 cm(-1). Comparisons with theoretical calculations indicate that all of tire transitions observed wercassociatcd with the UO2+2 subunit. They involved the promotion ofan electron from a bonding orbital to the mcial-cenicred 5f(delta) and 5f(phi) orbitals Band origins and vibrational constants for five excited slates were obtained Fluorescence was observed from the lowcst-energy excited state alone, regardless of the excitation wavelength. The decay curve was found to be bocxponeruial, with characierism decay lifetimes of 50 and 260 mu s
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