[Contribution to the study of the radiofrequency spectroscopy of the vinyl bromide molecule. II. Monodeuterated and /sup 13/C-substituted vinyl bromide. Second order quadrupole coupling, molecular structure]

For Pt.I, see abstr. A46601 of 1970, and see also Abstr. A46600 of 1970. The author studied the pure rotational spectrum of the fundamental vibrational state of molecules CH/sub 2/CHBr, CH/sub 2/CDBr, CHDCHBr (trans), CDHCHBr (cis), /sup 79/Br and /sup 81/Br isotopes. The assigned transitions are from the /b a/ type as well as the /b b/ one, and for high values of J. The first order analysis of the hyperfine structure due to the quadrupole moment of Bromine nucleons was not sufficient. The author has introduced a second order calculation. The results confirm the assumption that the axis of the quadrupole is the axis of the CBr bond. He uses the Watson's formulas in the calculation of the transition frequency. For high J states he has added a partial second order correction in the distortion. The accuracy obtained in his calculation is better than 0.3 MHz for the unperturbed frequency. Finally he proposes a structure of the molecule. This structure is in a good agreement with the results of D. Kivelson (1960) for CH/sub 2/CHCe and J. Beaudet (1969) for CH/sub 2/CHCHBr.