Amino Wagging and Inversion in Methylamines

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Abstract
Fine structures have been observed of the amino‐wagging bands at 780 cm—1 of CH314NH2, at 776 cm—1 of CH315NH2, at 625 cm—1 of CH314ND2, and at 689 cm—1 of CH314NHD. For each vibration—rotation line an appreciable inversion splitting is observed. There is a marked coupling found between the inversion and the internal rotation; and the amount of the inversion splitting of each absorption line depends greatly upon the internal rotation quantum number σ (=0, +1, or —1) and the over‐all rotation quantum number K of the state in question. A hypothetical inversion splitting when the coupling were absent is estimated to be 31.6 cm—1 for the first excited state of the amino‐wagging vibration of CH314NH2.

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