Inelastic Resonance Emission of X Rays: Anomalous Scattering Associated with Anomalous Dispersion

Sparks, C. J.

doi:10.1103/physrevlett.33.262

Cited by 198 publications

(81 citation statements)

References 11 publications

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“…60 Numerous studies have been reported on this phenomenon, termed x-ray resonant Raman scattering (XRRS), and it continues to be an active field of research. 37,38 Key early experiments include those of Sparks, 61 Eisenberger et al, 62 and Briand et al 63 The variations in x-ray spectral energies, intensities, and line shapes observed in those experiments are well explained by theoretical treatments 62,64,65 based on the resonant term of the Kramers-Heisenberg formulation of photon-scattering processes. 3,45,60 There is much current interest in using XRRS to study electronic structure of solids 66 and the dynamics of molecules excited at inner-shell resonances.…”

Section: X-ray Resonant Raman Scattering From Atomsmentioning

confidence: 97%

X-Ray Scattering and Fluorescence From Atoms and Molecules

Southworth

Young

Kanter

et al. 2000

Photoionization and Photodetachment

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Section: X-ray Resonant Raman Scattering From Atomsmentioning

confidence: 97%

X-Ray Scattering and Fluorescence From Atoms and Molecules

Southworth

Young

Kanter

et al. 2000

Photoionization and Photodetachment

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“…In the scattering curves of these samples, the increase of intensity for s J 0.4 nm À1 must have caused by other scattering effects. As the energy was chosen such that fluorescence was avoided, the additional scattering observed can be expected to be produced by resonant X-ray Raman scattering [33]. The intensity of this scattering effect, which may occur for energies smaller than that of the absorption edge, depends on the atoms contained in the sample, but it is independent on the scattering angle.…”

Section: Anomalous Small Angle Scattering Of Zinc and Strontium Phospmentioning

confidence: 99%

The structure of phosphate glass evidenced by small angle X-ray scattering

Walter

Goerigk

Rüssel

2006

Journal of Non-Crystalline Solids

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Numerous phosphate glass systems with compositions covering the entire glass forming range have been examined by small angle Xray scattering. The experiments were carried out in a widely extended interval of s values between 0.055 and 31 nm À1 . A small angle scattering effect was detected for all samples investigated with the exception of the aluminium metaphosphate glass. The small angle scattering recorded indicates the presence of two differently-sized heterogeneity regions of electron density. The small-scale heterogeneities are present in magnesium and zinc phosphate glasses only. Their size is about 1 nm diameter in the magnesium and about 2 nm in the zinc phosphate glasses. The species do not result from liquid-liquid phase separation. Examinations to extract information on the nature of these heterogeneity regions are described in detail. There is no fundamental knowledge on the large-scale heterogeneities established. The small angle scattering suggests that their occurrence is related to water contamination. Anomalous small angle X-ray scattering experiments of a series of zinc polyphosphate glasses and a strontium metaphosphate glass sample are performed to examine the distribution of the Zn or Sr atoms, respectively.

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“…The size of the f' component roughly doubles as the energy gap between the incident x-ray energy E I and the absorption edge E K is halved. Near an edge, the size of the inelastic background grows rapidly due to RRS (Sparks, 1974;Eisenberger et al, 1976a, b;Åberg and Crasemann, 1994). RRS is interpreted as the filling of a virtual hole by a bound electron.…”

Section: Removal Of Inelastic Scattering Backgroundsmentioning

confidence: 99%

X‐ray and Neutron Diffuse Scattering Measurements

Ice

Robertson

Sparks

2012

Characterization of Materials

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Diffuse scattering from crystalline solid solutions is used to measure local compositional order among the atoms, dynamic displacements (phonons), and mean species‐dependent static displacements. It can also provide information on defects including vacancies, interstitials, dislocations and truncated sample dimensions. In locally ordered alloys, fluctuations of composition and interatomic distances break the long‐range symmetry of the crystal within local regions and contribute to the total energy of the alloy. Local ordering can be a precursor to a lower temperature equilibrium structure that may be unattainable because of slow atomic diffusion. In addition to local atomic correlations, neutron diffuse scattering methods can be used to study the local short‐range correlations of the magnetic moments. Interstitial defects, as opposed to the substitutional disorder defects described above, also disrupt the long‐range periodicity of a crystalline material and give rise to diffusely scattered x‐rays, neutrons, and electrons. This article will concentrate on the use of diffuse x‐ray and neutron scattering from single crystals to measure local chemical correlations and chemically specific static displacements. Particular emphasis is placed on the use of resonant (anomalous) x‐ray techniques to extract information on atomic size from binary solid solutions with short‐range order. By separating this diffuse intensity into its component parts we are able to recover pair correlation probabilities for the three kinds of pairs in a binary alloy. The interpretation of diffuse scattering associated with dynamic displacements of atoms from their average crystal sites are discussed briefly in this article.

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Inelastic Resonance Emission of X Rays: Anomalous Scattering Associated with Anomalous Dispersion

Cited by 198 publications

References 11 publications

X-Ray Scattering and Fluorescence From Atoms and Molecules

X-Ray Scattering and Fluorescence From Atoms and Molecules

The structure of phosphate glass evidenced by small angle X-ray scattering

X‐ray and Neutron Diffuse Scattering Measurements

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