Abstract
An EPR, ENDOR and optical study of manganese in CaF 2 has been made. It was found that two different Mn 2+ centres were present, both having cubic symmetry without axial components. One of these is well known in the literature and its EPR spectrum is characterized by a very small cubic field splitting and a well resolved fluor hyperfine structure. The other centre shows no resolved superhyperfine structure and a larger cubic field splitting. The spin hamiltonian parameters of both centres have been determined accurately at three temperatures, 4.2, 77 and 295°K. This temperature dependence is discussed briefly. The ENDOR measurements have shown that the second Mn 2+ centre is Mn 2+ at a Ca 2+ site with no fluorine first neighbours. Analysing the results of the EPR, ENDOR and optical measurements we have reached the conclusion that, most probably, centre II is Mn 2+ at a Ca 2+ site and surrounded by six or eight oxygen ions.
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