Dispersed fluorescence spectra of the CCl2 Ö vibronic bands

Abstract

Laser excited, dispersed fluorescence spectra have been recorded for a number of bands of the Ö electronic transition of CCl₂. Analysis of the data yields well defined values for the harmonic and anharmonic constants for the symmetric ground state vibrations. Additional lines are observed at red shifts ≥5000 cm⁻¹ from the origin, which are not assignable in terms of the known and à state structure. A possible explanation for these transitions would be perturbations of the singlet structure by the low-lying triplet ã state.