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The intercombination $a^3\Pi - X^1\Sigma^+$ Cameron system of carbon monoxidehas been computationally studied in the framework of multi-reference Fock spacecoupled cluster method with the use of generalized relativistic pseudopotentialmodel for the effective introducing the relativity in all-electron correlationtreatment. The extremely weak $a^3\Pi_{\Omega=0^+,1} - X^1\Sigma^+$ transitionprobabilities and radiative lifetimes of the metastable $a^3\Pi$ state werecalculated and compared with their previous theoretical and experimentalcounterparts. The impact of a presumable variation of the fine structureconstant $\alpha=e^2/\hbar c$ on transition strength of the Cameron system hasbeen numerically evaluated as well.

Ab initio relativistic treatment of the intercombination $a^3\Pi-X^1\Sigma^+$ Cameron system of the CO molecule