THE DECAY LIFETIME OF NACL-AG- A NEW INTERPRETATION( FLUORESCENCE )

The fluorescence of Ag+ in NaCl was investigated in the range of 21-30 0 K, in particular by performing accurate lifetime measurements. Lifet ime values in the range of 21-100 K are consistent with the Pedrini mo del for Cu+ and Ag+ de-excitation. in contrast, lifetime values above 100 K are not consistent with the relationship involved in such a mode l simply because above 100 K the relative fluorescence quantum yield i s not unity: this explains the puzzling results obtained in the past b y Pedrini in NaCl:Ag+. Lifetime data were found irrespective of Ag+ co ncentration in the samples. (C) 1998 Elsevier Science B.V.