The picosecond state??selective dynamics and photochemistry of the molecule A–(CH2) 3–φ, where A and φ are aromatic chromophores, was studied under collision??free conditions in a supersonic beam. Time??resolved fluorescence measurements of the reactant and the charge transfer (exciplex) product were undertaken as a function of specific vibrational energy above the zero point level of S 1. From these studies along with an analysis of the ...