ROTATION-INVERSION SPECTRUM OF CYANAMIDE

The research described in this paper was performed by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.Author Institution: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CaliforniaThe rotation-inversion spectrum of cyanamide was measured with the intent of accurately determining the inversion frequency, the A rotational constant, and numerous centrifugal distortion constants so that line positions can be calculated for interstellar molecular searches. A total of 146 rotational transitions between 7.0 - 500.0 GHz including 64 inversion-rotation frequencies were measured. These lines, along with previously reported transitions in cyanamide, were fit using a Watson Hamiltonian which includes an interaction between the lowest two inversion states. The inversion frequency is 1.486007(1) terahertz (49.56787(3) $cm^{-1}$). The nuclear quadrupole coupling constants of the two lowest states and both components of the molecular dipole moment have been determined