Prediction of vibrational energy levels for the CO molecule and 7Li2 dimer

Through solving the Schrodinger equation with the improved Poschl-Teller potential energy model, we obtain a new vibration???rotation energy spectrum representation for diatomic molecules. Using the developed energy spectrum expression and experimental data of four molecular constants for the X-1 Sigma(+) state of the CO molecule and the a(3)Sigma(+)(u) state of Li-7(2) dimer, we predict the vibrational energy levels. The predicted values from the improved Poschl-Teller potential are in better agreement with the vibrational energy values of the direct potential fit and experimentally observed data reported in the literature than those obtained from the improved Tietz potential.