Studies on Ag^- Centers in Alkali Halides. III. Polarization and Decay-Time of Luminescence

Abstract

Polarized emissions from Ag - centers and radiative lifetimes of Ag - and Ag - (Na) centers were measured for several kinds of potassium halides. Polarization diagrams for the C emission of Ag - centers were obtained as a function of excitation wavelength and temperature. The decay time of the A emission was measured against varying temperature. The experiments demonstrate that emissions occur from trigonally distorted configurations and suggest that the spin-orbit coupling constant should be diminished during lattice relaxations. A set of adiabatic potential surfaces for the Ag - center was constructed which can explain all the experimental results.