Abstract
This article outlines some of the ways in which microwave spectroscopy can yield information pertaining to internal molecular movements. The main experimental features of the technique are summarized and the effect of hindered internal rotation of a methyl group on the overall rotational spectrum is briefly discussed. Illustrative examples from current research work include the determination of methyl barriers in substituted methyl formates, tunnelling of hydrogen in propargyl alcohol, cis and trans isomerism in acrylic acid and internal rotation of two methyl groups in isopropyl fluoride.
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