Radiative correction to x-ray scattering and its relevance in condensed-matter experiments

Rocchi, C.; Sacchetti, F.

doi:10.1103/physrevb.47.15283

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…The frad contribution was found to be "~0.001f0 (Rocchi & Sacchetti, 1993), i.e. smaller than the experimental errors and the nuclear Thomson contribution, fu = 0.008r0, was neglected as well.…”

Section: Coppermentioning

confidence: 98%

“…f~LE is the anomalous-scattering contribution as deduced from the dispersion-relation approach (Gell-Mann et al, 1954) and assumed to be independent of the site. frad(G, S) is the contribution due to the so-called radiative corrections (Sacchetti, 1987;Rocchi & Sacchetti, 1993;Jauch & Rohrlich, 1980), which turns out to be proportional to fro(G, s) (Rocchi & Sacchetti, 1993). Actually, additional contributions are expected when the photon energy increases, namely Delbruck scattering and nuclear giant resonance, however, they are almost completely negligible in the energy range of the experiments performed to date (Sacchetti, 1987;Jauch & Rohrlich, 1980 …”

Section: Analysis Of Experimental Datamentioning

confidence: 99%

“…The experiment reported by Hansen et al (1984) was performed at 412 keV incoming photon energy and this, according to the estimate of Rocchi & Sacchetti (1993), makes the frad and f~E contributions safely negligible.…”

Section: Berylliummentioning

confidence: 99%

“…Even though working in the y-ray region has the advantage of reducing extinction and anomalous-scattering effects, experiments carried out at relativistic photon energies cannot be interpreted by straightforward application of the non-relativistic scattering theory (Dewey et al, 1994;Smith, 1987;Sacchetti, 1987;Rocchi & Sacchetti, 1993). Extension of the theory to relativistic energies is not simple owing to the difficulties in treating the complex many-body interactions among the electrons and the interactions of the electrons with the external electromagnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…Extension of the theory to relativistic energies is not simple owing to the difficulties in treating the complex many-body interactions among the electrons and the interactions of the electrons with the external electromagnetic field. Moreover, as the photon-electron interaction is governed by the not vanishingly small fine-structure constant o~ (or "" 1/137), such an interaction must be treated at orders higher than the leading one (Rocchi & Sacchetti, 1993) when the accuracy of the experiment is pushed towards 0.1%.…”

Section: Introductionmentioning

confidence: 99%

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Relevance of Charge-Density Measurements for High-Precision Calculations

Petrillo¹,

Sacchetti²,

Mazzone³

1998

Acta Cryst Sect A

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High-precision photon diffraction data in beryllium, diamond, silicon, copper and germanium are reanalysed with the aim of assessing the accuracy of experimental X-ray and )/-ray structure factors by comparing derived values for cohesive energy with the thermochemical ones. Special attention is devoted to the diffraction data analysis for a meaningful and accurate comparison between theory and experiment. A good overall agreement of local density approximation calculations is found when the electron density exhibits spherical symmetry around each atomic site. On the contrary, the analysis of experimental data in 3d transition metals, namely vanadium, chromium, iron, cobalt and nickel, points out failures of the theory in reproducing the asphericity of the electron distribution.

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Section: Coppermentioning

confidence: 98%