DECAY KINETICS OF CE3-EXCITATION AND KRF EXCIMER-LASER EXCITATION IN CEF3 SINGLE-CRYSTALS( IONS UNDER GAMMA)

Measurements of the decay kinetics of regular Ce3+ emission in CeF3 si ngle crystals have been performed under photo-excitation and gamma (Na -22 radioisotope) excitation. While flashlamp-excited photoluminescenc e decay is distorted mainly by the influence of the 'near-surface' tra ps, the multiexponential nature of the scintillation decay is explaine d using pair interaction of close-lying Ce3+ excited ions, which accou nt for the discrete character of their distances. Measurements of the same photoluminescence decay under high-intensity laser excitation sho w a similar departure from exponentiality as in the case of scintillat ion decay and support the proposed model.