Gibbs free energy and enthalpy of LiH molecule: Manning-Rosen plus Hellmann potential

In the paper, the thermodynamic properties (TPs) of lithium hydride (LiH) have been investigated using Manning-Rosen plus Hellmann potential within the statistical mechanics' background. To this end, the Schro center dot dinger equation (SE) has been analytically solved using the Nikiforov-Uvarov (NU) procedure, and the energy levels have been determined. Then, the partition function of the system and its thermodynamic properties such as the Gibbs free energy, enthalpy, and specific heat at constant pressure have been analytically determined by the Poisson summation formula. The average absolute deviations of the results from the empirical data are 1.981%, 1.623%, and 1.725% for specific heat, Gibbs free energy, and enthalpy, respectively. It is found that the potential model can be used to predict the TPs of the LiH molecule.