Bound states for the rotating Rydberg oscillator Original Research Article

Three methods for calculating the levels of the rotating Rydberg oscillator are compared: Two versions of the shifted 1/N expansion and the WKB method. Results are presented for the ground state of the H2 molecule. The WKB method gives the best results for a majority of the levels. In other cases the WKB results are only slightly less accurate than the best ones.