A paramagnetic point defect has been observed in high purity single crystals of calcium oxide, after neutron irradiation. The electron paramagnetic resonance spectrum is described by an orthorhombic g tensor with principal axes approximately along [211]-, [111]- and [110]-type directions and with S = ½. It is suggested that the defect may be an F-aggregate centre similar to Pick's N 1 centre.
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R. G. Bessent (1969) studied this question.
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