Abstract
The 6 1Π u state of sodium dimer has been observed up to v = 53 in excitation spectra of the 6 1 Π u ← X 1 Σ g + system, recorded by polarisation labelling spectroscopy technique. The Dunham coefficients are derived and the potential energy curve constructed by the inverted perturbation approach method. Equilibrium constants for the 6 1Π u state of Na 2 are: T e = 35446.06 ± 0.04 cm −1 (with respect to the minimum of the electronic ground state), Y 10 = 111.388 ± 0.019 cm −1, Y 01 = 0.112122 ± 0.000017 cm −1.
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