Abstract
The Na 2(3 sσ g )(4 sσ g ) 2 3Σ + g state of Na 2 has been observed and studied by cw perturbation-facilitated optical-optical double-resonance (PFOODR) spectroscopy for the first time. A single-mode dye laser and a Ti-sapphire laser served as the pump and the probe lasers, respectively. A total of 543 PFOODR excitation signals have been assigned to the 2 3Σ + g ← b 3Π 1u transitions. Absolute vibrational numbering was determined by counting nodes in the 2 3Σ + g → a 3Σ + u bound-free spectra. Spectroscopic constants and the corresponding RKR potential energy curve are presented in this vsork. The values of T e, R e, and D e, are found to be 25 551.237(49) cm −1, 3.53463(35) Å, and 6211.5(1) cm −1 respectively.
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