O ct 2 02 0 Ab initio relativistic treatment of the intercombination a 3 Π − X 1 Σ + Cameron system of the CO molecule †

Nikolai S. Mosyagin, Alexander V. Oleynichenko, Andrei Zaitsevskii, Artur V. Kudrin, Elena A. Pazyuk, and Andrey V. Stolyarov Petersburg Nuclear Physics Institute named by B. P. Konstantinov of National Research Center “Kurchatov Institute”, 188300, Leningradskaya oblast, Gatchina, mkr. Orlova roscha, 1, Russia and Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Leninskie gory 1/3, Russia (Dated: December 4, 2021)