The rotational spectrum of methylamine-d3

Authors:

• Marek Kręglewski,
• W. Jäger,
• H. Dreizler

Abstract

The rotational spectrum of CD₃NH₂ has been measured in the 26-41 GHz region using a Stark spectrometer and in the 26-36.5 GHz region using a microwave Fourier transform spectrometer. A total of 39 lines have been identified and assigned in the ground vibrational state using a rotation-inversion-internal rotation Hamiltonian. The lines show unusual nuclear quadrupole hyperfine splittings. These can be explained using a theoretical model which accounts for the influence of the inversion-internal rotation-rotation coupling on the hyperfine structure. The equilibrium geometry and inversion-internal rotation potential function of CD₃NH₂ have also been determined. From the data for methylamine-d₃ and -d₅ the diagonal quadrupole coupling tensor for methylamine has been calculated. © 1990.