Abstract

The ground state rotational spectra of methylthioethyne and cis-propanal have been investigated. An overall fit of the measurements using the Internal Axis Method has allowed us to accurately determine the internal rotation parameters. The moments of inertia of methyl groups obtained from an internal rotation analysis are reviewed. They are compared to the values calculated using two empirical correlations found by McKean: between the isolated stretching frequencies and the corresponding CH bond lengths or the HCH angles.

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