Sensitive overtone spectroscopy of carbonyl sulfide between 6130 and 6650 cm(-1) and at 12000 cm(-1)

A multipass optoacoustic cell and a color center laser have been used to record Doppler-limited overtone spectra of carbonyl sulfide in the spectral region between 6130 and 6650 cm(-1). To obtain spectra around 12 000 cm(-1) we used a phase modulation diode laser spectrometer. Eight bands of (OCS)-O-16-C-12-S-32 and two bands of (OCS)-O-16-C-12-S-34 could be detected and assigned for the first time. Comparing the spectra with the results of a global rovibrational analysis gives an agreement within 0.05 cm(-1). In some cases the effect of the l resonance was calculated in a local model, in order to show its influence on the rotational energies. (C) 1996 Academic Press, Inc.