Abstract
Dynamics of the electronically excited state of 9,9‘-bianthryl(BA) was studied in gas-phase clusters with acetonitrile (ACN), BA-(ACN)n (n = 1−5). The gas-phase clusters were formed by supersonic expansion of BA/acetonitrile/He mixtures. In the laser-induced fluorescence spectra, new absorption bands ascribed to the BA-(ACN)n clusters were observed at longer wavelength side of the S1−S0 transition of BA. The mass-selected two-color resonance-enhanced multiphoton ionization (REMPI) spectra were measured to determine the absorption band for the cluster of BA with the specific number of the acetonitrile molecules. The dispersed fluorescence (DF) spectra and lifetimes were measured for these absorption bands to study the dynamics of the excited state of BA in the clusters, BA-(ACN)n. For all clusters studied, the DF spectra of BA were broad and largely red shifted compared with that of unclustered BA. The fluorescence lifetimes of BA in the clusters were considerably longer than that of unclustered BA. These ...
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