It was demonstrated that (F2+)AH centers in this halide could be produced by doping Czochralski-grown crystals with K2CO3 and NaCl. It was found that the optical properties of the (F2+)AH centers which were produced in this way were exactly the same as those of (F2+)AH centers which were prepared using the usual technique; which involved super-oxide doping and a controlled atmosphere.

M.Diaf, I.Chihi, A.Hamaidia, A.El Akrmi: Journal de Physique III, 1996, 6[1], 1-6