MOLECULAR-STRUCTURE OF PROTONATED CYANOGEN, HNCCN+, BY MILLIMETER-WAVE SPECTROSCOPY

The rotational spectra of the four monosubstituted isotopomers of protonated cyanogen (HNCCN+)-C-13, (HNCCN+)-C-13, (HNCCN+)-N-15, and (HNCCN+)-N-15, in the ground vibrational state have been investigated in the spectral region from 130-270 GHz, using a negative glow discharge production method. From the moments of inertia of the five monosubstituted species, including the DNCCN+ isotopomer [G. Cazzoli et al, Chem. Phys. Lett. 194, 297 (1992)] and of the parent species HNCCN+ [T. Amano and F. Scappini, J. Chem. Phys. 95, 2280 (1991)], the complete r(s) structure has been obtained. The alchemy of the ion production has been further improved compared to the previous works.