Approximate Solutions of the Schr dinger Equation for the Eckart Potential and Its Parity-Time-Symmetric Version Including Centrifugal Term

The energy eigenvalues and eigenfunctions of the Schr dinger equation for Eckart potential as well as the parity-time-symmetric version of the potential in three dimensions with the centrifugal term are investigated approximately by using the Nikiforov-Uvarov method. To show the accuracy of our results, we calculate the energy eigenvalues for various values of n and l. It is found that the results are in good agreement with the numerical solutions for short-range potential (large a). For the case of 1/a i/a, the potential is also studied briefly.