ISOTOPE EFFECTS ON MOLECULAR DIPOLE MOMENTS. MICROWAVE SPECTRUM OF MONODEUTEROACETYLENE
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Date
1964
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Ohio State University
Abstract
An accurately spaced parallel plate gas phase microwave spectrometer has been constructed for the purpose of precise measurements of molecular dipole moments. The spectrometer utilizes the Stark effect. It is found that substitution of deuterium for ordinary hydrogen causes an easily detectable change in the molecular dipole moment of simple molecules. An example is methylacetylene where the values 0.780 D, 0.769 D, 0.784 D, and 0.772 D are found for $CH_{3}CCH, CH_{3}CCD, CD_{3}CCH, CD_{3}CCD$, respectively. These and other results will be discussed. With another spectrometer employing very high Stark fields, pure rotational absorption has been observed for $J=0$ to $J=1$ of HCCD and a small permanent dipole moment observed.
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Author Institution: Department of Chemistry, Stanford University