Abstract
The free jet millimeter-wave absorption spectra of the propylene oxide–Ar complex is reported. The Ar atom lies, with respect to the plane of the COC ring, on the same side of the methyl group ( syn conformer). This is in contrast with the results of MP2/6-311++G ∗∗ calculations, which give the anti conformer slightly more stable. The ab initio geometry of the syn species is, however, in agreement with the experimental findings. The dissociation energy has been estimated, from the D J centrifugal distortion constant, to be about 3 kJ/mol.
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