Structural spectrum of anthracene-vapor fluorescence at ambient pressure

Abstract

Results of complex investigating the conditions of appearing and objective laws of exhibiting a structural spectrum of anthracene-vapour fluorescence are presented. The data show that the usage of the suggested procedure permits to obtain such highly-resolved spectra (in heated vapours of aromatic compounds) as those in the case of deep cooling in matrices and molecular jets.As a rule, spectra of complex multi-atomic molecules of aromatic compounds in a gas phase have no fine structure1. However,the narrowing of radiation bands and the appearance of individual quasi-lines against diffuse bands are observed in radiation spectra of some aromatic molecules in the case of specific conditions of excitation.Previous researchers have noted that a quasi-linear spectrum of vapour fluorescence is observed in exciting only in the region of a 0-0 transition.Our investigations have shown the existence of regions of excitation wavelengths referred as excitation zones where fluorescence spectra retain their quasi-linear structuie27. The most complete experimental and theoretical investigations of quasi-linear spectra were perfonned for anthracene. Fig. 1 shows a quasilinear spectrum of anthracene-vapour fluorescence.