The parallel type methyl amine band at 10μ has been resolved. Its center is at 1045.27 cm—1, and the very regular structure of its P and R branches indicates a close approximation to axial symmetry. The mean of the two largest moments of inertia is 37.43 × 10—40 g·cm2. Assuming angles and distances for NH2 as in ammonia, and for CH3 as in methane, the C–N distance is computed to be 1.48 × 10—8 cm. Certain enhanced lines suggest a superposed perpendicular band. The 13μ band is partially resolved, and assigned to a motion corresponding to v3 in NH3. The bands arising from vibrations characteristic of the amino and methyl groups have been examined but could not be resolved.
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Owens et al. (1940) studied this question.
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