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On the real part of the anomalous-dispersion term of atomic scattering factors. II. Theoretical part
The real part of the anomalous-dispersion term is calculated by an approximate treatment which is equivalent to working from Pauli's equation. No use is made of the forward-scattering approximation. Although small λ-independent corrections are required, it turns out that the theory of Cromer & Liberman [J. Chem. Phys. (1970), 53, 1891-1898] is essentially correct in accordance with the experiment of Saka & Kato [Acta Cryst. (1987), A43, 252-254]. The magnetic-scattering term [Jensen (1979). Phys. Lett. A, 74, 41-44; (1980). J. Phys. B, 13, 4337-4344] cannot be theoretically justified.
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