INTERMOLECULAR FORCE-FIELD AND APPROXIMATE EQUILIBRIUM STRUCTURE OF VARIOUS COMPLEXES CONTAINING ONE OR 2 RARE-GAS ATOMS FROM MICROWAVE SPECTROSCOPIC CONSTANTS

The quartic centrifugal distortion constants of a class of van der Waa ls complexes containing one or two rare gas atoms have been used to de termine a complete force field for the intermolecular vibrations. In s uch complexes with C-s or C-2v symmetry the rare gas atom is attached above a symmetry plane or two rare gas atoms are arranged symmetricall y to this plane. Small amplitude motions and an analytical form of an anharmonic interaction potential have been assumed for the centrifugal distortion analysis. Vibrational corrections have been applied to two of the planar moments of inertia for the estimation of a pseudoequili brium structure. The influence of the intramolecular vibrations on the centrifugal distortion of these complexes has also been considered.