The method of polarized orbitals used in calculating electron-atom scattering amplitudes has two obvious flaws: the wave function is discontinuous, and the method is not variationally based. These are corrected in a somewhat arbitrary manner, and it is found that the results then depend upon a parameter of the theory sufficiently strongly that there are serious doubts about the predictive nature of the theory.
M. H. Mittleman and J. Peacher, "Critical Assessment of the Polarized-Orbital Method in Atomic Scattering," Physical Review, vol. 173, no. 1, pp. 160-164, American Physical Society (APS), Sep 1968.
The definitive version is available at http://dx.doi.org/10.1103/PhysRev.173.160
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© 1968 American Physical Society (APS), All rights reserved.