The metastable triplet state of the M centre in CaF2

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Abstract
Optical excitation of additively coloured CaF2 crystals gives rise to population of a metastable excited 3 Sigma u-type state of the M centre. The optical excitation spectrum of this state has been investigated. Measurement of the epr spectrum of the 3 Sigma u state confirms a model proposed earlier by Beaumont and Hayes) for the M centre in CaF2. The lifetime of the 3 Sigma u state at 77K is 1.7 s. The temperature dependence of creation and of decay of the 3 Sigma u state population has been investigated by optical and epr methods; the mechanisms of creation and decay are discussed.
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