THE MICROWAVE SPECTRUM OF METHYLAMINE-$d_{5}$
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Date
1956
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Ohio State University
Abstract
The microwave spectrum of $CD_{3}ND_{2}$ has been investigated in an effort to elucidate the structure of the methylamine molecule. A series of lines in which the rotational transition is of the type ${J}_{OJ}\rightarrow {J}_{1J}$ has been studied in the 24000-35000 Mc regions. Each rotational transition is split into four lines, with spacings of the order of 100 Mc, as a result of the internal motion. These splittings have been analyzed on the basis of a hindered internal rotor with additional terms to include the possibility of inversion of the $ND_{2}$ group. Preliminary values for molecular constants are: reciprocal principal moments: 52420 Mc, 16550 Mc, 15570 Mc; quadrupole coupling constants: $\chi_{aa} = 2.4 Mc, \chi_{bb} = 2.1 Mc, \chi_{cc} = -4.5 Mc$; barrier to internal rotation: $V_{a} = 590$ $cm^{-1}$.
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Author Institution: National Bureau of Standards