THE 2-NU-3 BAND OF (SO2)-S-32-O-16 - LINE POSITIONS AND INTENSITIES

The room temperature high resolution infrared spectrum of the 2ν3 band of 32S16O2 in the 3.7 μm region has been studied with a difference-frequency laser spectrometer and completely analyzed. The rotational levels of the upper state (002) have been reproduced to an accuracy of ±0.00008 cm-1 using a Hamiltonian matrix which explicitly takes into account the weak Fermi-type interaction coupling the rotational levels of the (002) state with those of the (130) state yielding a band origin ν0 = 2713.382660(6) cm|-1 and a complete set of rotational constants and a Fermi-type interaction constant. This band exhibits a pronounced Herman-Wallis effect. However, the intensities have been very satisfactorily fit leading to a precise vibrational transition moment for the 2ν3 band. Finally, a comprehensive set of line positions and intensities has been generated. For this band, the integrated band intensity has been found to be Sv (T = 296 K) 9.81(20) × 10-5 cm-1 Pa-1 m-1 (0.0995(20) cm-2 atm-1). A set of harmonic frequencies and vibrational anharmonic constants have been obtained. The effects of Darling-Dennison interaction appear to be very small. © 1993 Academic Press, Inc.