High resolution Fourier transform spectra of a sample of sulfur dioxide enriched in 34S (95.3%). have been completely analyzed leading to a large set of assigned lines. The experimental levels derived from this set of transitions have been fit to within their experimental uncertainties using Watson-type Hamiltonians. Precise band centers, rotational and centrifugal distortion constants have been determined. The following band centers in cm-1 have been obtained: 0(3 2)=1538.720198(11), 0( 1+ 3)=2475.828003(33), 0( 1+ 2+ 3)=2982.118596(19), 0 (2 3)=2679.80221(34), and 0(2 1+ 3)=3598.3598.773915(38). The rotational constants obtained in this work have been fit together with the rotational constants of lower lying vibrational states [ W.J. Lafferty, J.-M. Flaud, R.L. Sams and EL Hadjiabib, in press] to obtain equilibrium constants as well as vibration-rotation constants. Finally these equilibrium constants have been fit together with those of 32S16O2 [J.-M. Flaud and W.J. Lafferty, J. Mol. Spectrosc. 16 (1993) 396-402] leading to an improved equilibrium structure.
Citation: Journal of Molecular Spectroscopy
Pub Type: Journals
Anharmonic vibrational constants, Equilibrium ro-vibrational constants, Equilibrium structure, High resolution infrared spectra