Optical and thermal properties of F and F aggregate centers in KF

A detailed investigation has been carried out of the optical and thermal properties of centers such as F, F_A, M and M_A in pure, Na-doped and Li-doped KF. Most centers exhibit properties which are qualitatively similar to those produced in other potassium halides with the notable exception of the F_A (Na) center, which has both Type I and Type II behavior.