FOURIER-TRANSFORM SPECTROSCOPY OF CARBONYL SULFIDE FROM 4800 TO 8000 CM(-1) AND NEW GLOBAL ANALYSIS OF (OCS)-O-16-C-12-S-32

We have measured the FT spectrum of natural OCS from 4800 to 8000 cm(- 1) with a near Doppler resolution and a line-position accuracy between 2 and 8 x 10(-4) cm(-1). For the normal isotopic species (OCS)-O-16-C -12-S-32, 37 vibrational transitions have been analyzed for both frequ encies and intensities. We also report six bands of (OCS)-O-16-C-12-S- 34, five bands of (OCS)-O-16-C-13-S-32, two bands of (OCS)-O-16-C-12-S -33 and two bands of (OCS)-O-18-C-12-S-32. important effective Herman- Wallis terms are explained by the anharmonic resonances between closel y spaced states. As those results complete the study of the Fourier tr ansform spectra of natural carbonyl sulfide from 1800 to 8000 cm(-1), a new global rovibrational analysis of (OCS)-O-16-C-12-S-32 has been p erformed. We have determined a set of 148 molecular parameters, and a statistical agreement is obtained with all the available experimental data. (C) 1998 Academic Press.