Laser Stark spectroscopy of thioformaldehyde in the 10-μm region: The ν3, ν4, and the ν6 fundamentals
The ν3, ν4, and ν6 bands of thioformaldehyde, H 2CS, have been studied using the technique of laser Stark spectroscopy. The H 2CS was produced by the pyrolysis of dimethyl disulfide, and the spectrum was observed using a multipass absorption cell. The band origins are ν3, 1059.2037 cm -1; ν4, 990.1866 cm -1; and ν6, 991.0149 cm -1. The band previously assigned as 2 ν6 has been reassigned as 2 ν2, leading to a value of the ν2 band origin of ca. 1439 cm -1. Rotational constants and dipole moments of the vibrational states have been determined.