A variational algebraic method used to study the full vibrational spectra and dissociation energies of some specific diatomic systems

The results of the Na2-C1Πu state have shown that the new VAM (variational algebraic method) energies EυVAM(5) beautifully reproduce the experimental data and converge to the correct dissociation limit, while the original AM energies EυAM(8) converge to a wrong dissociation limit that is 2159.066 cm−1 lower than the experimental dissociation energy! Their RKR curves are shown in Fig 1.