Measurements of X-Ray Anomalous Scattering Factors near the Cu K Absorption Edge by the Use of Synchrotron Radiation

Fukamachi, T.; Kawamura, Takaaki; Hunter, S. H.; Nakano, Yuji

doi:10.7567/jjaps.17s2.326

Cited by 24 publications

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“…There is a discrepancy due to a chemical shift by the oxidation state of the atom and the local chemical environment. Many attempts have been made near an absorption edge to measure anomalous scattering factors for relatively simple materials using various X-ray techniques, such as using an X-ray interferometer (Bonse & Materlik, 1976), the intensity ratio of Friedel-pair reflections (Fukamachi & Hosoya, 1975), total reflection measurement (Fukamachi et al, 1978), the index of refraction through a prism (Fontaine et al, 1985) and integrated intensity measurement (Templeton et al, 1980). A realistic determination of f 0 may be to use the dispersion relation of the Kramers-Kronig integral because of its easy access to the data.…”

Section: Introductionmentioning

confidence: 99%

Residual-density mapping and site-selective determination of anomalous scattering factors to examine the origin of the FeKpre-edge peak of magnetite

Okube

Yasue

Sasaki

2012

J Synchrotron Radiat

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The electron-density distribution and the contribution to anomalous scattering factors for Fe ions in magnetite have been analyzed by X-ray resonant scattering at the pre-edge of Fe K absorption. Synchrotron X-ray experiments were carried out using a conventional four-circle diffractometer in the right-handed circular polarization. Difference-Fourier synthesis was applied with a difference in structure factors measured on and off the pre-edge (E(on) = 7.1082 keV, E(off) = 7.1051 keV). Electron-density peaks due to X-ray resonant scattering were clearly observed for both A and B sites. The real part of the anomalous scattering factor f' has been determined site-independently, based on the crystal-structure refinements, to minimize the squared residuals at the Fe K pre-edge. The f' values obtained at E(on) and E(off) are -7.063 and -6.682 for the A site and -6.971 and -6.709 for the B site, which are significantly smaller than the values of -6.206 and -5.844, respectively, estimated from the Kramers-Kronig transform. The f' values at E(on) are reasonably smaller than those at E(off). Our results using a symmetry-based consideration suggest that the origin of the pre-edge peak is Fe ions occupying both A and B sites, where p-d mixing is needed with hybridized electrons of Fe in both sites overlapping the neighbouring O atoms.

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Section: Introductionmentioning

confidence: 99%

Residual-density mapping and site-selective determination of anomalous scattering factors to examine the origin of the FeKpre-edge peak of magnetite

Okube

Yasue

Sasaki

2012

J Synchrotron Radiat

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“…Then, by the best use of an SSD (solid-state detector), it was shown that the determination of the anomalous-scattering factors as functions of energy and some applications of these factors such as polarity determination are feasible in a typical laboratory Hosoya, 1975;Fukamachi & Hosoya, 1975;Fukamachi, Hosoya & Okunuki, 1976a,b;Fukamachi, Hosoya, Kawamura & Okunuki, 1977. Concurrently, the advent of synchrotron radiation has opened great possibilities in this field (Bonse & Materlik, 1976;Phillips, Wlodawer, Yevitz & Hodgson, 1976;Phillips, Wlodawer, Goodfellow, Watenpaugh, Sieker, Jensen & Hodgson, 1977;Fukamachi, Hosoya, Kawamura & Hastings, 1977;Fukamachi, Hosoya, Kawamura, Hunter & Nakano, 1978).…”

Section: Introductionmentioning

confidence: 99%

Phase-angle determination by anomalous X-ray scattering with a four-circle SSD diffractometer

Sakamaki¹,

Hosoya²,

Fukamachi³

1980

Acta Cryst Sect A

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By the use of a four-circle diffractometer with a solidstate detector, the integrated Bragg reflexion intensities from hemimorphite [Zn4Si2Ov(OH)2.H20] have been measured by energy-dispersive diffractometry at three energy values, including the region very near the Zn K absorption edge. The anomalous difference Patterson map obtained indicated Zn-Zn peaks. By the use of the anomalous-scattering effect to the maximum extent, the phases of one hundred reflexions have been determined with a mean error of 15.4 °

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“…These range from the EXAFS-type experiments of Dreier et al (1984) to X-ray interferometer beam contrast experiments made by Bonse and HartmannLotsch (1984). Measurements made by Fukamachi et al (1978) using the KramersKronig transform and the critical angle technique exhibit similar features. Within each experimental data set reproducibility and self-consistency are very good.…”

Section: (Aj Experiments Close To An Absorption Edge: Copper and Nickelmentioning

confidence: 48%

Theoretical and Experimental Techniques for the Determination of X-ray Anomalous Dispersion Corrections

Creagh¹

1985

Aust. J. Phys.

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Aust. J. Phys., 1985,38, 371-404 Theoretical and experimental techniques for the determination of the X-ray anomalous dispersion corrections f'(w, LI) and fl/(w, LI) are discussed. The results of experiments on metallic, ionic and covalently bonded materials typified by copper and nickel, lithium fluoride, and silicon respectively are compared with the theoretical predictions. Attention is drawn to deficiencies in both the experimental and the theoretical approaches.

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Measurements of X-Ray Anomalous Scattering Factors near the Cu K Absorption Edge by the Use of Synchrotron Radiation

Cited by 24 publications

References 0 publications

Residual-density mapping and site-selective determination of anomalous scattering factors to examine the origin of the FeKpre-edge peak of magnetite

Residual-density mapping and site-selective determination of anomalous scattering factors to examine the origin of the FeKpre-edge peak of magnetite

Phase-angle determination by anomalous X-ray scattering with a four-circle SSD diffractometer

Theoretical and Experimental Techniques for the Determination of X-ray Anomalous Dispersion Corrections

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