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The microwave spectra of (CH 3 ) 2  15 NNO, (CH 3 ) 2 N 15 NO, syn- 13 CH 3  12 CH 3 NNO and anti- 13 CH 3  12 CH 3 NNO have been studied and the rotational constants evaluated. With these data and former results  1  the r s -structure of the carbon-nitrogen frame has been found to be planar. An r 0 -structure has also been calculated. From the hyperfine structure of the spectra the nuclear quadrupole coupling constants of the nitrogen nuclei have been determined. Further studies to complete the r s -structure are in progress.

r 0 -Structure, Partial r-Structure, and Nitrogen Nuclear Quadrupole Coupling Constants of N-Nitroso-dimethylamine