Laser-induced fluorescence of the A2πu-X2πg transition of CS2+ in solid Ne. Reanalysis of vibronic spectra

Dispersed fluorescence spectra in the spectral range 475–575 nm and fluorescence excitation spectra in the range 410–480 nm were recorded for the A2πu-X2πg system of CS2+ and its 13C- and 34S-isotopic species. Based on a comparison of the relative extents of 13C- and 34S-isotopic shifts, new assignments for Fermi polyads of the X2πg state were derived; they are consistent with recent variational Renner-Teller calculations by Brommer and Rosmus based on three-dimensional potential energy functions derived from ab initio calculations. According to an analogous argument, the vibronic levels of the A2πu state are assigned based on observed 13C- and 34S-isotopic shifts.