INCOHERENT 4-WAVE-MIXING ON NILE BLUE AND CRESYL VIOLET IN GLASS AND POLYMER AT 5 K - SINGLE-SITE LINE-SHAPE ANALYSIS

Time-delayed-four-wave-mixing (TDFWM) experiments performed on nile bl ue and cresyl violet at 5 K using incoherent laser radiation yield a r esponse which depends dramatically on excitation conditions. Fast (fem tosecond) and slow (picosecond) processes, variable peak shifts, and t ype I and II quantum beats are all observed according to the laser fre quency omega(L) and bandwidth Delta omega(L). We model the TDFWM respo nse on the basis of a site-independent molecular response and an assoc iated inhomogeneous distribution function. These functions are constru cted by combining information from TDFWM and fluorescence-line-narrowi ng (FLN) experiments. (C) 1996 American institute of Physics.