The microwave fourier transform, millimeter-wave, and submillimeter-wave rotational spectra of isocyanogen, CNCN

• Published in: Journal of molecular spectroscopy Vol. 140; no. 1; pp. 147 - 161
• Main Authors: Gerry, M.C.L., Stroh, F., Winnewisser, M.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.03.1990; Elsevier
• Subjects: Atomic and molecular physics; Exact sciences and technology; Fine and hyperfine structure; Molecular properties and interactions with photons; Physics; Properties of molecules and molecular ions; Fourier transformation; Bond length; Submillimetric wave; Rotational transition; Rotational constant; Stark effect; Centrifugal distortion constant; Experimental study; Rotational analysis; Millimetric wave; Isotope effect; Quadrupole coupling constant; Gaseous state; Microwave spectrum; Molecular constant; Vibrationally excited state; Dipole moment
• ISSN: 0022-2852; 1096-083X
• DOI: 10.1016/0022-2852(90)90013-G

The rotational spectra of isocyanogen, CNCN, and its four monosubstituted isotopomers 13CNCN, CN 13CN, C 15NCN, and CNC 15N in natural abundance in the ground vibrational state have been investigated in the spectral region from 10 to 550 GHz. The nuclear electric quadrupole hyperfine structures of the low- J transitions of the various isotopomers and of CNCN in three excited vibrational states have been analyzed and precise nuclear quadrupole coupling constants for the two 14N nuclei have been obtained. For 12C 14N 12C 14N the magnetic spin-rotation coupling constants could also be determined. The high- J millimeter- and submillimeter-wave transitions allowed the determination of accurate rotational and centrifugal distortion constants of all five isotopomers. From the respective moments of inertia a complete r s-structure for CNCN has been obtained: ▪ The permanent electric dipole moment of CNCN in its ground vibrational state was determined by Stark-effect measurements to be 0.7074(52) D.