Comment on: 'PT-/non-PT-symmetric and non-Hermitian Hellmann potential: Approximate bound and scattering states with any ℓ-values'

Abstract

We carry out an analysis of the paper published in Arda and Sever (2014 Phys. Scr. 89 105204) and reveal several unclear points. In the first place, the derivation of the main equations does not appear to be correct. In the second place, the expression for the energy does not appear to yield the results reported by the authors. In the third place, they failed to indicate the references reporting the eigenvalues chosen for comparison. In the fourth place the eigenvalues reported by the authors do not show the same order as those of the Hellmann potential thus leading to a different underlying physics. What is more: the spectrum of the modified model is qualitatively different from the one supported by the Hellmann potential.