Analysis of the Na243Σg+ state above and below the 3s + 3d atomic limit

The experimental ro-vibrational term values of the Na243Σg+ state both below and above the 3s + 3d atomic limit are analyzed. The multiparameter (double-well modified Lennard-Jones-DWMLJ) model function is proposed to fit a double-well potential. The earlier reported vibrational numbering of the predissociated terms (above 3s + 3d) is corrected and the final DWMLJ potential function for the Na243Σg+ state is reported.