Zeeman and uniaxial stress studies of some zero-phonon lines in luminescent CaO

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Abstract
A sharp emission line at 682.8 nm has been found in luminescent CaO containing F-centres. Zeeman data were similar to those obtained on the well-documented 3P to 1S emission line at 574.1 nm from the F-centre. The effect of uniaxial stress on the 682.8 nm line was qualitatively similar to that on the 574.1 nm line. The 682.8 nm emission line may derive from H- ions, although the presence of F-centres appears to be necessary for the existence of the emission line. Further evidence is presented that the adsorption lines at 571 and 1731 nm, previously reported in neutron-irradiated CaO, both derive from an even-electron system with orthorhombic I symmetry. F-centres also appear to be required for this centre to exist in CaO and the centre may be a nearest-neighbour pair of F-centres.