Abstract
The mm-wave spectra of 14N32SF3 in the excited vibrational states v 5 = 1 and v 6 = 1 have been recorded. Analyses of these have yielded values for the Av rotational constants and hence a better determined structure. In addition the coriolis constants ζ55 z = -0·2256 (18) and ζ66 z = 0·1569 (15) have been obtained. These have been combined with accurate measurements of the centrifugal distortion constants of the ground state, some isotopic vibrational data and ζ66 z = 0·1657 (15) for 14N34SF3 to give a good estimate of the most general valence force field.