Abstract
The rotation-torsion spectrum of carbodiimide, HNCNH, a constituent of the vapour of the well-known interstellar molecule cyanamide, H2NCN, was measured in the region from 20 GHz to 330 cm−1 using a high resolution Fourier transform spectrometer, a laser single sideband spectrometer, a millimeter wave and a submillimeter wave spectrometer. The spectral pattern of a perpendicular band system of an almost perfect accidental symmetric top, expected for skew-chain molecules, was observed. The principal axis b is parallel to the C 2 symmetry axis of HNCNH. The molecular constants obtained by fitting the positions of the torsional doublet centers with Watson’s Hamiltionian in S-reduction are A=379244.493(27) MHz, B=10366.9389(18) MHz, and C=10366.0837(25) MHz which yield κ=−0.999995368(18). Small splittings of the observed rotational lines were found to be due to a torsional motion. Excerpts of the experimental data and the effective molecular constants of HNCNH relevant for radioastronomy are given.
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© 1989 Springer-Verlag Berlin Heidelberg
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Winnewisser, M. (1989). Laboratory spectroscopy: The rotation-torsion spectrum of carbodiimide, HNCNH. In: The Physics and Chemistry of Interstellar Molecular Clouds: mm and Sub-mm Observations in Astrophysics. Lecture Notes in Physics, vol 331. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0119508
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DOI: https://doi.org/10.1007/BFb0119508
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