Abstract
The rate of relaxation between off-centre sites of Ni 2+ and Co 2+ substitutional defects in SrO is determined from the response of the optical absorption to an electric field. This is achieved not by direct lifetime measurement but by an alternative and sensitive technique in which the optical signal is monitored exactly out of phase with a modulated electric-field. It is found that the temperature dependence of relaxation lifetimes in the range 70μs to 13ms for Ni 2+ ions is consistent with a simple classical thermally-activated process, a result which is to be held in contrast with the situation for Co 2+.
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