The microwave spectrum of pyridine has been studied in the region from 20 000 to 40 000 Mc. Twelve low-J R-branch lines have been identified. Analysis of the spectrum requires that the dipole moment lie in the a axis, and leads to the following values of rotational constants: a=6039.436 Mc, b=5804.997 Mc, c=2959.210 Mc, and κ=+0.847781. The dipole moment of pyridine vapor was found to be 2.15±0.05 D from quantitative Stark effect studies.
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DeMore et al. (1954) studied this question.
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