Abstract
The interpolation of atomic scattering factors is discussed. Analytical approximations by the method of orthogonal polynomials and by Lagrangian interpolation are presented and are compared with methods reported previously. The accuracy of interpolation is estimated and an application of the technique in the calculation of structure factors is suggested, particularly with reference to small computers. The working range is restricted to values of (sin θ)/λ between 0 and 0.7.