Approximations for the Interpretations of X-Ray K Absorption Spectra
The interpretations of X-ray absorption edges rely on approximations which are often not very completely justified. Particular attention is given an approximation used by Parratt for argon atoms in which the K-excited terms of argon are compared to the optical terms of potassium. It is pointed out that this approximation is very poor in the range of small atomic numbers, and this approximation also predicts the wrong number of X-ray term values. This approximation is investigated by applying the Hartree equations without exchange to the neon atom in the configuration 1s 2s 2 2p 6 3s and by comparing the results with a similar calculation for sodium in the configuration 1s 2 2s 2 2p 6 3s.
KeywordsArgon Atom Nickel Metal Potassium Atom Hartree Equation Neon Atom
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