Determination of the dipole moment of thioformaldehyde in the [formula omitted]3A 2 excited state by laser phosphorescence excitation spectroscopy

Abstract

Doppler-limited phosphorescence excitation spectra have been recorded at various electric fields for two rotational transitions in the a 3A 2- X 1A 1 0-0 band of H 2CS. Stark splittings were resolved, and were used to determine the dipole moment in the excited electronic state. The value found, 0.57(3) D, is of the order expected by comparison with dipole moments determined for other states of H 2CS, but rather lower than that predicted by ab initio calculations.