MICROWAVE SPECTRUM, VAN DER WAALS BOND LENGTH, AND 131Xe QUADRUPOLE COUPLING CONSTANT OF Xe-SO3

Nine isotopologues of Xe-SO$_{3}$ have been observed by pulsed-nozzle Fourier transform microwave spectroscopy. The complex is a symmetric top with a Xe-S van der Waals distance of 3.577(2) {AA}. The increase in rare gas distance relative to that in Kr-SO$_{3}$ is equal to the difference in van der Waals radii between Xe and Kr. The $^{131}$Xe nuclear quadrupole coupling constant indicates that the electric field gradient at the xenon nucleus is 78% larger than that at the Kr nucleus in Kr-SO$_{3}$