More on the Quantum Efficiency of the F‐Centre in Alkali Halides

Abstract

Recently Baldacchini reviewed / 1 / the quenching processes related to the F-centre luminescence in alkali halides. W e want to limit our attention to the intrinsic ones.Bartram

Empirical Calculation of the Bulk Modulus for the Alkali Halide Crystals

“…Recently, in color center as well as in defect physics, we adopted [4] the Sanderson model for nonmolecular structures which utilizes an unequivocal scheme in determining the ionic radii; we obtained predictions for off-center configurations of impurity ions in alkali halides and oxides [4], for FA (II-type) center formation [5] and for F-center luminescence quantum yield [6] in alkali halides (incidentally, it should be remembered that we found [7] also a correlation between the Sanderson partial charge and the Szigeti effective charge).…”

On the Use of the Rabin and Klick Diagram

“…The quantity S / D obviously is a measure of the space available for a halide atom to be inserted between two halide ions along a face diagonal: S is given by (a/@) -d, where a is the lattice constant and d ( = 2 r _ ) is the halide ion diameter (i.e. twice the anion radius r -) .Townsend Recently, we adopted 151 in color center as well as in defect physics the Sanderson model for non-molecular structures which utilizes a univocal scheme in determining the ionic radii; we obtained a forecast for off-center configuration of impurity ions in alkali halides and oxides [5], for FA (11-type) center formation [6], and for F-center luminescence quantum yield [7] in alkali halides (incidentally, we recall that we found [8] a correlation between the Sanderson partial charge and the Szigeti effective charge). Very recently our scheme was adopted by other authors [9] in an analysis of the anharmonicity of the OH-and OD-stretching mode in alkali halides.…”

“…for non-molecular structures which utilizes a univocal scheme in determining the ionic radii; we obtained a forecast for off-center configuration of impurity ions in alkali halides and oxides [5], for FA (11-type) center formation [6], and for F-center luminescence quantum yield [7] in alkali halides (incidentally, we recall that we found [8] a correlation between the Sanderson partial charge and the Szigeti effective charge). Very recently our scheme was adopted by other authors [9] in an analysis of the anharmonicity of the OHand OD-stretching mode in alkali halides.…”