The fifth of a series of publications on the high resolution rotation-vibration spectra of sulfur trioxide reports the results of a systematic study of the v3(é) and 2v3(A1?+E?) infrared bands of the four symmetric top isotopomers 32S16O3, 34S16O3, 32S18O3, and 34S18O3. An internal coupling between the l = 0 and l = +2 levels of the 2v3 (A1?+E?) states was observed. This small perturbation results in a level crossing between K-l = 9 and 12, in consequence of which the band origins of the A1?, l=0 “ghost” states could be determined to a high degree of accuracy. Ground and upper state rotational as well as vibrational anharmonicity constants are reported. The constants for the center-of-mass substituted species 32S16O3 and 34S16O3 vary only slightly, as do the constants for the 32S18O3, 34S18O3 pair. The S-O bond lengths for the vibrational ground states of the species 32S16O3, 34S16O3, 32S18O3 and 34S18O3, are, respectively, 141.981992(6), 141.979412(20), 150.605240(73), and 150.602348(73) pm, where the uncertainties, given in parentheses, are two standard deviations and refer to the last digits of the associated quantity.
Revised: September 3, 2008 |
Published: December 1, 2003
Citation
Sharpe S.W., T.A. Blake, R.L. Sams, A. Maki, A. Masiello, J.B. Barber, and N. Vulpanovici, et al. 2003.The v(2) and 2 v3 Bands of (SO3)-S-32-O-16, (SO3)-S-32-O-18, (SO3)-S-34-O-16 and (SO3)-S-34-O-18.Journal of Molecular Spectroscopy 222, no. 2:142-152.PNNL-SA-37992.