The ground state and electronic spectrum of CUO: a mystery
Abstract
Results are presented from a theoretical study of the lower electronic states of the CUO molecule. Multiconfigurational wave functions have been used with dynamic correlation added using second order perturbation theory. Extended basis sets have been used, which for uranium were contracted including scalar relativistic effects. Spin–orbit interaction has been included using the state-interaction approach. The results predict that the ground state of linear CUO is Φ2 with the closed shell Σ+0 state 0.5 eV higher in energy. This is in agreement with matrix isolation