Spherically bent mica analyzers as universal dispersing elements for X‐ray spectroscopy

Joseph, Emily S.; Jahrman, Evan P.; Seidler, Gerald T.

doi:10.1002/xrs.3143

Cited by 2 publications

(1 citation statement)

References 73 publications

(81 reference statements)

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“…This may be labelled either b or c, with Parthé and Gelato 20 preferring the former. Muscovite, recently proposed for making spherically bent X-ray energy analyzers 37 , belongs to this group. c.) finally, in α quartz.…”

Section: Choice Of Convention For Describing a Crystal Structurementioning

confidence: 99%

PyCSFex: an extensible Python three package for calculating x-ray structure factors in complex crystals

Sutter,

Pittard,

Filik

et al. 2023

Advances in Computational Methods for X-Ray Optics VI

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Near-perfect diffracting crystals have many uses in x-ray optics including as monochromators, energy analyzers, and phase retarders. The usefulness of a particular Bragg reflection is often related to its angular acceptance and efficiency, as is determined by the reflection’s structure factor. Silicon crystals, which belong to the same face-centered cubic space group 𝐹𝑑3̅𝑚 as germanium and diamond, are readily available in large and highly pure ingots. Combined with their high thermal conductivity and low thermal expansion, this makes them suitable for synchrotron x-ray beamlines. However, less symmetric trigonal crystals such as sapphire, lithium niobate, and α-quartz offer a better choice of high-energy-resolution Bragg reflections near backscattering with less likelihood of parasitic Bragg reflections. Because these crystals’ atoms vibrate anisotropically and shift relative to each other with temperature, the temperature dependence of their structure factors is not a given by a simple Debye-Waller factor. Also, many crystal structures may be described by several different conventions of origin and lattice vectors. A Python three software package, PyCSFex, is presented here for the rapid calculation of large numbers of structure factors of any crystal described in any convention. It can run on its own or as part of an already existing software package. Users can extend the package to new crystals by writing their own material files. α-Quartz is chosen as an example because it has already been successfully used in backscattering x-ray energy analyzers and presents the complexities previously mentioned.

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Section: Choice Of Convention For Describing a Crystal Structurementioning

confidence: 99%

PyCSFex: an extensible Python three package for calculating x-ray structure factors in complex crystals

Sutter,

Pittard,

Filik

et al. 2023

Advances in Computational Methods for X-Ray Optics VI

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Harmonics as an alternative method for measuring I during x-ray absorption spectroscopy experiments at laboratory scale

Bès

Takala

Huotari

2021

Review of Scientific Instruments

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In the recent years, the advent of an efficient and compact laboratory-scale spectrometer for x-ray absorption spectroscopy experiments has been extensively reported in the literature. Such modern instruments offer the advantage to routinely use x-ray absorption spectroscopy on systematic studies, which is usually unconceivable at synchrotron radiation source facilities due to often limited time access. However, one limiting factor is the fact that due to laboratory x-ray source brightness compared to a synchrotron, two separate measures of the incoming and transmitted x-ray intensities, i.e., the so-called I 0 and I 1 , respectively, are usually required. Herein, we introduce and discuss an alternative approach for measuring I 0 and I 1 simultaneously. Based on the usage of harmonics arising naturally from the use of monochromator crystals, the reliability and robustness of our proposed approach is demonstrated through experiments at the Co K-edge measured using Co metal foil and at the Nd L 3 -edge measured in Nd 2 O 3 .

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Spherically bent mica analyzers as universal dispersing elements for X‐ray spectroscopy

Cited by 2 publications

References 73 publications

PyCSFex: an extensible Python three package for calculating x-ray structure factors in complex crystals

PyCSFex: an extensible Python three package for calculating x-ray structure factors in complex crystals

Harmonics as an alternative method for measuring I during x-ray absorption spectroscopy experiments at laboratory scale

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