Abstract
The rotational spectrum of acetaldehyde-1- d 1 (CH 3CDO) has been investigated between 8 and 40 GHz with a conventional Stark-modulated spectrometer. All observed transitions were split by the internal rotation of the methyl group. Rotational constants, centrifugal distortion constants and internal rotation parameters have been fitted to the measured transition frequencies. The deuterium quadrupole splittings of seven low- J transitions have been studied with a pulsed-nozzle beam microwave Fourier transform spectrometer. The deuterium quadrupole coupling constants have been determined in the principal inertial axis system.
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