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Updating of x‐ray coherent scattering cross‐sections and their effects in microbeam and material analysis applications
Author(s) -
Tartari Agostino,
Taibi Angelo,
Bonifazzi Claudio,
Gambaccini Mauro,
de Felici Marina
Publication year - 2005
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.847
Subject(s) - scattering , microbeam , attenuation , computational physics , physics , photon , optics , intensity (physics) , momentum transfer , materials science
New small angle coherent scattering data are presented in order to emphasize the need to update available open‐access databases. The first aim is to integrate the present atomic form factor tabulations, which permit us to obtain the linear differential scattering coefficient of a compound from a simple weighted sum of the elemental components, by including the effect of the large‐scale arrangement of the sample structure beside the molecular interference effect. These features, which can lead the intensity of scattered photons to present huge upturns at small values of the momentum transfer, are presented for some biological tissues and poly(methyl methacrylate) and their influence on the calculation of both the coherent mass attenuation coefficient and the total value is investigated. Copyright © 2005 John Wiley & Sons, Ltd.