Hydrogenic wavefunctions and perturbation theory

  title={Hydrogenic wavefunctions and perturbation theory},
  author={J. R. Killingbeck},
The use of hydrogenic orbitals in atomic calculations is discussed, and values are given for the non-traditional F(k) and M(k) integrals needed in variational calculations. The method used for their derivation is also applied to derive two other integrals, which are used to give a generalization of previous first-order perturbation calculations of for the 1s 2 state of two-electron ions.