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We present a combined experimental and theoretical study on the radiativelifetime of CO in the $a^3\Pi_{1,2}, v=0$ state. CO molecules in a beam areprepared in selected rotational levels of this metastable state,Stark-decelerated and electrostatically trapped. From the phosphorescence decayin the trap, the radiative lifetime is measured to be $2.63\pm0.03$ ms for the$a^3\Pi_1, v=0, J=1$ level. From spin-orbit coupling between the $a^3\Pi$ andthe $A^1\Pi$ state a 20% longer radiative lifetime of 3.16 ms is calculated forthis level. It is concluded that coupling to other $^1\Pi$ states contributesto the observed phosphorescence rate of metastable CO.

The radiative lifetime of metastable CO ($a^3\Pi, v=0$)