Abstract
Nine isotopologues of Xe–SO3 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) Å. The increase in rare gas distance relative to that in Kr–SO3 is equal to the difference in van der Waals radii between Xe and Kr. The 131Xe 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–SO3.
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