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M. ROTGER, V. BOUDON AND M. LOËTE, Laboratoire de Physique de l'Université de Bourgogne, CNRS UMR 5027, 9, Avenue Alain Savary, B.P. 47 870, F-21078 DIJON Cedex, France; L. MARGULÈS AND J. DEMAISON, Laboratoire de Physique, Atomes et Molécules, CNRS UMR 8523, Université de Lille I, Bât. P5, 59655 Villeneuve d'Ascq Cedex, France; H. MÄDER, Institut für Physikalische Chemie, Universität Kiel, Olshausenstr. 40, D-24098 KIEL Germany; G. WINNEWISSER AND H. S. P. MÜLLER, I. Physikalisches Institut, Universität zu Köln, D-50937 KÖLN Germany.
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The analysis of the ground state rotational spectrum of SO2F2 has been performed with the Watson's Hamiltonian up to sextic terms but shows some limits due to the A and S reductions. Since SO2F2 is a quasi-spherical top, it can also be regarded as derived from an hypothetical XY4 molecule. Thus we have developped a new tensorial formalism in the \mathbfO(3) \supset Td \supset C2v group chain. We test it on the ground state of this molecule using the same experimental data (0--1 THz region, J up to 99). Both fits are comparable even if the formalisms are slightly different. This talk intends to establish a link between the classical approach and the tensorial formalism. In particular, our tensorial parameters at a given order of the development are related to the usual ones. Programs for spectrum simulation and fit using these methods are named C2vTDS. They are freely available at the URL:
\hspace2.0cm\tt http://www.u-bourgogne.fr/LPUB/c2vTDS.html