Relaxation in the 3T1u state of F centres in CaO

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Abstract
We have studied by optical detection the relaxation in the 3T 1u excited state of F centres in CaO using microwaves in the X band. At 1.7 K both a slow and a fast recovery are observed. The slow component, equal to the radiative lifetime (3.7 ms) is due to a variation of the total population of the 3T1u level. The fast component is due to transitions from one Jahn-Teller well to another. Evidence is given that both the tetragonal and the trigonal components of the phonon induced strain field have to be considered. All these relaxations depend very much on the static internal strains. Numerical calculations using the distribution of strains determined in previous work fit the experimental data