High-resolution Fourier transform infrared spectra of 12C32S, 12C33S, 12C34S,and 13C32S

The v = 1-0 infrared absorption bands of the ¹²C³²S, ¹²C³³S, ¹²C³⁴S, and ¹³C³²S isotopes and the v = 2-1 “hot” band of ¹²C³²S all in the ground electronic state were measured using a high-resolution Fourier transform spectrometer coupled to a long-path absorption cell. P- and R-branch transitions, up to J = 41 for ¹²C³²S, have been measured at 0.004 cm⁻¹ unapodized resolution. Rotational and centrifugal distortion parameters which are improved over those obtained in previous diode laser measurements for the less abundant ¹²C³³S and ¹³C³²S isotopes are reported. Improved v = 1-0 band origins of the various isotopes are also reported. Analysis included published microwave data along with the present IR measurements. The present results are compared with previous infrared diode laser, Fourier transform spectrometer, and microwave measurements.