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Photoinduced site distortion and persistent spectral hole burning in Cm4+ :CeF4

โœ Scribed by G.K. Liu; James V. Beitz

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
560 KB
Volume
171
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

An unusual laser-induced, reversible, crystal structure distortion in a dilute actinide material, 0.1% Cm'+ : CeF,, is reported.

Distortion of one of two non-equivalent actinide ion sites occurs after photoexcitation of 5f states of Cm'+. Distinct spectral lines of the distorted ion site were detected by selective excitation. The site distortion was found to be stable below 45 K and reverted via a thermally activated process at higher temperature. At low temperature, typically 30 K or lower, persistent spectral holes were burnt in some absorption lines of distorted site Cm'+. Excited-state vibronic coupling and an assumed asymmetric two-minimum ground state potential surface provide a consistent basis for understanding the observed site distortion and hole burning.

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Analysis of the holeshapes allowed us to separate the homogeneous and inhomogeneous broadening contributions to this absorption band. The lifetimes T, of the excited states at 4.2 K are estimated to he not less than 80 and 30 fs for ferrocytochrome c and oxymyoglobin, respectively.