Deuterium Isotope Effects on Molecular Dipole Moments by Microwave Spectroscopy

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Abstract
A special parallel‐plate microwave spectrometer has been constructed and the effect of deuteration on the dipole moment in the ground vibrational state of seven different molecules has been measured. The molecules studied were: methylacetylene, propane, methyl fluoride, fluoroform, vinylidene fluoride, methylsilane, and methylgermane. With the exception of fluoroform, where an effect of 0.001 D was observed, the magnitude of the isotope effect was found to be of the order of 0.01 D. A simplified interpretation of the isotope effects leads to information about the signs of the dipole moments in these molecules.