X-ray Optics and Synchrotron Beamlines

Cramer, Stephen P.

doi:10.1007/978-3-030-28551-7_4

Cited by 3 publications

(3 citation statements)

References 67 publications

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“…This section describes a range of synchrotron spectroscopy techniques for the analysis of chemical and local environment elemental analysis, such as using X-ray fluorescence (XRF), X-ray absorption near edge structure (XANES), X-ray absorption spectroscopy (XAS), and Fourier transform infrared spectroscopy (FTIR). For additional details on spectroscopy, the readers are directed to [ 643 , 644 , 645 , 646 , 647 , 648 , 649 ].…”

Section: Synchrotron (Circular Particle Accelerator)mentioning

confidence: 99%

Synchrotron X-ray Studies of the Structural and Functional Hierarchies in Mineralised Human Dental Enamel: A State-of-the-Art Review

et al. 2023

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Hard dental tissues possess a complex hierarchical structure that is particularly evident in enamel, the most mineralised substance in the human body. Its complex and interlinked organisation at the Ångstrom (crystal lattice), nano-, micro-, and macro-scales is the result of evolutionary optimisation for mechanical and functional performance: hardness and stiffness, fracture toughness, thermal, and chemical resistance. Understanding the physical–chemical–structural relationships at each scale requires the application of appropriately sensitive and resolving probes. Synchrotron X-ray techniques offer the possibility to progress significantly beyond the capabilities of conventional laboratory instruments, i.e., X-ray diffractometers, and electron and atomic force microscopes. The last few decades have witnessed the accumulation of results obtained from X-ray scattering (diffraction), spectroscopy (including polarisation analysis), and imaging (including ptychography and tomography). The current article presents a multi-disciplinary review of nearly 40 years of discoveries and advancements, primarily pertaining to the study of enamel and its demineralisation (caries), but also linked to the investigations of other mineralised tissues such as dentine, bone, etc. The modelling approaches informed by these observations are also overviewed. The strategic aim of the present review was to identify and evaluate prospective avenues for analysing dental tissues and developing treatments and prophylaxis for improved dental health.

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Section: Synchrotron (Circular Particle Accelerator)mentioning

confidence: 99%

Synchrotron X-ray Studies of the Structural and Functional Hierarchies in Mineralised Human Dental Enamel: A State-of-the-Art Review

et al. 2023

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“…So, the function value of 𝑔 is the average transmission < 𝑅 2 > (𝑅 2 = 𝑅 PM 𝑅 grating ) in the first (internal) diffraction order over several points in an energy range. In this paper, the PM efficiency (𝑅 PM ) and grating efficiency (𝑅 grating ) for each given set of parameters are calculated using the REFLEC program [11], based on methods described by Neviere et al [12]. In this case: a set of candidate values of (𝑥 1 , 𝑥 2 , 𝑥 3 , .…”

Section: Framework For the Monochromator Efficiency Optimizationmentioning

confidence: 99%

Automatic transmission optimization of the plane-grating monochromator using collimated light

Shi

Tang²,

Jian-xin³

2022

J. Inst.

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It is essential to perform plane-grating monochromator transmission optimization for synchrotron radiation beamlines. Usually, The optimization is time-consuming. In this contribution, an automatic transmission optimization method for the plane-grating monochromator using collimated light based on the Differential Evolution (DE) algorithm is introduced. This method can quickly find the optimal solution. To test this method, a program developed using C++ is verified by optimizing the efficiency of a plane-grating monochromator with a 2000 lines/mm lamellar grating at soft X-ray region. Furthermore, the transmission optimizations of most of the PGM using lamellar gratings in soft x-ray region are performed.

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“…The fine structure in the emission profile can be resolved from a vertical cut through the RIXS plane at the resonant excitation energy (Figure 1e), known as RXES (resonant X-ray emission spectroscopy). 57 In this work, we report 3d4f RIXS to carry a quantitative sensitivity to actinide metal−ligand bonding and covalency in a study of the structurally analogous U(IV) hexahalide series [UX 6 ] 2− , where X = F, Cl, and Br. We identify halidedependent RIXS satellite intensities that carry sensitivity to metal−ligand bonding via the nephelauxetic effect.…”

Section: Introductionmentioning

confidence: 99%

Determination of Uranium Central-Field Covalency with 3d4f Resonant Inelastic X-ray Scattering

Burrow,

Alcock,

Huzan

et al. 2024

J. Am. Chem. Soc.

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Understanding the nature of metal−ligand bonding is a major challenge in actinide chemistry. We present a new experimental strategy for addressing this challenge using actinide 3d4f resonant inelastic X-ray scattering (RIXS). Through a systematic study of uranium(IV) halide complexes, [UX 6 ] 2− , where X = F, Cl, or Br, we identify RIXS spectral satellites with relative energies and intensities that relate to the extent of uranium-ligand bond covalency. By analyzing the spectra in combination with ligand field density functional theory we find that the sensitivity of the satellites to the nature of metal−ligand bonding is due to the reduction of 5f interelectron repulsion and 4f-5f spin-exchange, caused by metal− ligand orbital mixing and the degree of 5f radial expansion, known as central-field covalency. Thus, this study furthers electronic structure quantification that can be obtained from 3d4f RIXS, demonstrating it as a technique for estimating actinide-ligand covalency.

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X-ray Optics and Synchrotron Beamlines

Cited by 3 publications

References 67 publications

Synchrotron X-ray Studies of the Structural and Functional Hierarchies in Mineralised Human Dental Enamel: A State-of-the-Art Review

Synchrotron X-ray Studies of the Structural and Functional Hierarchies in Mineralised Human Dental Enamel: A State-of-the-Art Review

Automatic transmission optimization of the plane-grating monochromator using collimated light

Determination of Uranium Central-Field Covalency with 3d4f Resonant Inelastic X-ray Scattering

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