FLUORESCENCE OF Z1 CENTERS IN KCL

Detailed measurements on the absorption, emission and excitation spectra of Z1 centers in KCl doped with Ca, Sr or Ba are reported. Beyond the temperature dependence of the half widths and band positions of absorption and emission, the quantum efficiency for the fluorescence was measured and related to the known quantum yield of the F center emission. On polarized excitation the emission is also found to be highly polarized. From that a 〈110〉 symmetry for the Z1 center can be derived. © 1969 Springer-Verlag.