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

The room-temperature high-resolution infrared spectrum of the a-type 3ν3 asymmetric SO stretching overtone band of SO2 has been investigated at long path lengths (28-80 m) in two different laboratories using difference-frequency laser and Fourier-transform infrared spectrometers. The effectively unperturbed spectrum has been fit to a Watson asymmetric-top Hamiltonian to a precision of 0.0003 cm-1 to yield a band origin of 4054.00117(4) cm-1 and a complete set of rotational and centrifugal distortion constants. The intensities have been fit using Herman-Wallis type corrections to account for the Ka dependence of the effective vibrational transition moment, giving a rotationless transition moment, |μ1| = 3.1679(67) × 10-33C m (0.0009497(20) D), and an integrated band intensity for 32SO2, Sv = 3.79(15) × 10-5cm-1 m-1 Pa-1 (0.0384(15) cm-2 atm-1), at 295 K. The present results furnish data necessary to test the recent assignment of a feature in the infrared spectrum of Venus to the 3ν3 band of SO2. © 1992.