ESR measurements on X-irradiated undoped CaSO 4 single crystals at 77K reveal two related radiation damage centres. Step annealing measurements suggest a connection between these centres and the thermoluminescent glow peaks at approximately 395 and 465K. An analysis of the g-values (centre I: g x =2.006, g y =2.0091 and g z =2.0395; centre II; g x =2.0011, g y =2.0084 and g z =2.0256) in conjunction with the known crystal structure indicates that the defects could result from the removal of an electron from a non-bonding orbital of a sulphate oxygen atom adjacent to a Ca 2+ vacancy. The ESR signals related to these centres exhibit an unusual dependence on temperature and microwave power between 120 and 250K, which is attributed to a motional transition.
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Danby et al. (1982) studied this question.
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