Knowledge Bank

Triplet gerade states of $Na2$ below $X2\Sigma g+$ v = 0 and above 3s+3d dissociation limit were probed by perturbation facilitated optical-optical double resonance (PFOODR) $spectroscopy.1$ Two pulesed dye lasers were used as PUMP and PROBE lasers. The PUMP laser excited transitions from ground state, $X1\Sigma g+$, to the $A1\Sigma u+\sim b3\Pi u$ mixed intermediate levels and the PROBE laser further excited from the intermediate levels to high-lying triplet gerade states. Ultra-violet OODR fluorescence was detected. Several high-lying triplet gerade states were observed and assigned.