Abstract
In order to identify the ground state of CoN, we carried out calculations of multi-reference single and double excitation configuration interaction with Davidson-type correction and multi-reference coupled pair approximation (MRCPA). MRCPA predicts that 1Σ + is the ground state of CoN. The 5 Δ state lies only 0.223 eV above 1Σ +. Internuclear equilibrium distance, harmonic frequency, and rotational constants of 1Σ + agree well with experimental results.
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