ANOMALOUS DECAY OF THE SLOW COMPONENT OF PB2+ EMISSION

A theoretical model is introduced for the experimentally observed none xponential slow-component decay of Pb2+ ions in potassium halide cryst al hosts. It is based on the assumption that the adiabatic approximati on is violated for the slow emission process. The Hamiltonian of the m odel describes the lowest excited state of the system as two energy le vels resulting from the Jahn-Teller effect and from spin-orbit couplin g. It is parametrized by the lattice relaxation time scale and by latt ice-induced coupling and energy values for those levels. Using the mod el, a successful fit of the experimental data was obtained.