Microwave Spectrum of Methyl Isocyanate

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Abstract
The J0→1 and J1→2 a‐type transitions of CH3NCO and CD3NCO have been studied. These transitions are complicated by the population of a number of internal rotation states. Several absorptions arising from the lowest energy internal rotation states have been assigned. The barrier to internal rotation of the methyl group in CH3NCO has been found to be 49±3 cal/mole from the splitting of the J3→4, K=±1, m=±3 transition by the barrier. The component of electric dipole moment parallel to the a axis has been found to be 2.81±0.06 D by measurement of the Stark effect. The nitrogen quadrupole coupling constant has been found to be eqQ=+2.3 Mc/sec.