Abstract
The interaction potential energy of Mg-CO complex was calculated by employing ab initio method in the single and double excitation coupled-cluster theory with noniterative treatment of triple excitations [CCSD (T)] and large basis sets. The potential energy surface expressed by an analytical function was obtained for the first time as far as we know. A single global minimum occurs at Re= 8.98a0 and θe= 119.09° at an energy of -72.21 cm-1, and the potential energy surface has a weak anisotropy. Based on the potential, the rovibrational energy level structure of the Mg-CO complex was investigated. The microwave transition frequencies and spectroscopic parameters for the Mg-CO complex were theoretically predicted.
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