Anomalous Dispersion and Scattering of X-Rays

Parratt, Lyman G.; Hempstead, C. F.

doi:10.1103/physrev.94.1593

Cited by 170 publications

(68 citation statements)

References 28 publications

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“…The damping factor is 1 eV for the solid line and 3 eV for the dashed line. The value of 1 eV is the value calculated by the classical theory (Parratt & Hempstead, 1954). When the damping factor is 1 eV, the value of f °(]hi)+f'(to) becomes zero at an energy +1.3 eV from the edge.…”

Section: Theoretical Basismentioning

confidence: 99%

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X-ray dynamical diffraction in Ge with a zero-real-part scattering factor

Fukamachi¹,

Negishi²,

Yoshizawa³

et al. 1993

Acta Cryst Sect A

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X-ray dynamical diffraction induced only by the imaginary part of the scattering factor was measured using a Ge perfect crystal. The 844 integrated reflecting intensities near the K-absorption edge were measured in both the Bragg and the Laue cases. The intensities show the characteristic variations for the scattering factor having no real part, which agree well with theoretical predictions. There remains a slight difference between the theoretical [Fukamachi & Kawamura (1993). Acta Cryst. A49, 384-388] and the experimental energy position at which this occurs, which is related to the fine structure of the anomalous scattering factor above the absorption edge.

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Section: Theoretical Basismentioning

confidence: 99%

“…The values in Fig. 1 are calculated by the method of Parratt & Hempstead (1954) with the oscillator strength of Cromer (1965). The damping factor is 1 eV for the solid line and 3 eV for the dashed line.…”

Section: Theoretical Basismentioning

confidence: 99%

X-ray dynamical diffraction in Ge with a zero-real-part scattering factor

Fukamachi¹,

Negishi²,

Yoshizawa³

et al. 1993

Acta Cryst Sect A

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“…Indeed the semi-empirical theory of Parratt and Hempstead (1954) and the early work of Cromer (1965) made use of this inter-relationship. In both cases, however, power law fits were made to existing X-ray attenuation data originating in other laboratories and this simplified dependence of linear attenuation on photon energy was carried through in their calculations of 1'( w, 0).…”

Section: (C) X-ray Attenuation Techniquesmentioning

confidence: 99%

“…It would seem that measurement of ILl for a number of wavelengths should lead to the determination of both the imaginary and the real parts of the anomalous dispersion correction. Parratt and Hempstead (1954) and later Cromer (1965) used power law approximations to observed sets of measurements of ILl to determine the real and imaginary parts of the anomalous dispersion corrections. More recently other authors (Creagh 1975(Creagh , 1977(Creagh , 1980Gerward et al 1979;Henke et al 1982;Dreier et al 1984) have attempted to produce anomalous dispersion data from measurements of ILl.…”

Section: Introductionmentioning

confidence: 99%

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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“…The values of fAs (=--2"36) and fA= (=0"79) at the Ga K edge were obtained by use of the oscillator strength of Cromer (1965) and the formula of Parratt & Hempstead (1954). The temperature-factor values, BGa=BAs=0"91 A 2, of Uno, Okano & Yukino (1970) were adopted.…”

Section: Calculationmentioning

confidence: 99%