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The photoelectric absorption of x rays in atoms (K-, L-, and il

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N o r m a le u n d a n o m a le A b s o r p tio n v o n R ö n tg e n -S tr a h le n in G e r m a n iu m u n d S iliciu m Normal and anomalous absorption of X-rays in Germanium and Silicon A brief discussion of G. Moliere's generalized dynamical theory is given with respect to the interpretation of the experimental data ! % 1,/Z-o I obtained by means of the Borrmann effect.In order to compare theory and experiment photoelectric absorption cross sections for Silicon and Germanium have been calculated over the X-ray energy range from 5 to 25 keV. Linear ab sorption coefficients measured by us and other authors agree with theory within a few per cent.Taking the Debye-Waller factor into account, the same theoretical data have been used to cal culate J X

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