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Abstract
A nitrogen laser-excited windowless flow cell has been used to examine the effects of various quenching agents (CH3NO2, CC14, and CH3CH2I) on the fluorescence (FL), photoacoustic effect (PA), and two-photon photoionization (2PI) of pyrene in ethanol. The results show that both the lowest excited singlet state (S1) and the lowest triplet (TO) are involved as real intermediate states in the consecutive two-photon photoionization of pyrene.