Abstract
Spin-lattice relaxation time of the f 2 ion in the cubic XY 8 cluster, such as U 4+ in ThO 2 , is calculated by the nearest-neighbor point charge model. For the direct process, the ratio of two processes, one with a single- and another with a double-magnetic-quantum transition is a constant, 1 : 7.4. The Raman process relaxation time becomes so short that EPR spectrum is too broad to be observable somewhere between the liquid hydrogen and the liquid nitrogen temperatures. The Orbach relaxation process is absent because the crystal field splitting exceeds the maximum Debye phonon energy in ThO 2 . The desirability of low temperature relaxation experiments is stressed.
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