Abstract
An unusual laser-induced, reversible, crystal structure distortion in a dilute actinide material, 0.1% Cm 4+:CeF 4, is reported. Distortion of one of two non-equivalent actinide ion sites occurs after photoexcitation of 5f states of Cm 4+. 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 4+. Excited-state vibronic coupling and an assumed asymetric two-minimum ground state potential surface provide a consistent basis for understanding the observed site distortion and hole burning.
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