The C1Î u state of Na2 revisited: A comprehensive study by polarization labeling spectroscopy technique

This paper contains the analysis of the C(2)1Πu state of Na2 molecule based on a large data set (3030 lines) obtained from a polarization labeling spectroscopy experiment on the C1Πu←X1Σg+ transition. The energies of rovibrational levels in the C state, spanning a wide range of v (0 ⩽ v ⩽ 43) and J (12 ⩽ J ⩽ 100) quantum numbers, are fitted to a Dunham polynomial expansion and also to a numerical potential curve constructed by the inverted perturbation approach (IPA) method.