Abstract
We have studied the optical absorption, fluorescence excitation, and fluorescence emission spectra of single crystals of calcium fluorophosphate containing divalent manganese. A comparison of these measurements with electron-spin-resonance measurements made on the same crystals has enabled us to identify the optical excitation and emission spectra of divalent-manganese ions located on each of three inequivalent sites in the lattice. The sites observed are the Ca(I)-type site, the Ca(II)-type site, and a site similar to the Ca(II) site except with a "modified" environment. A fourth site, a "modified" Ca(I)-type, has been detected by electron spin resonance, but its optical properties could not be obtained. The excitation and emission spectra of manganese on the Ca(I), Ca(II), and Ca(II) "modified" sites are presented, as well as a discussion of the effects of temperature, manganese concentration, and crystal-growth conditions on the optical properties of the crystals.
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