Abstract
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 <r 1 n + r 2 n > for the 1s 2 state of two-electron ions.

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