Development of a Laboratory EXAFS Facility and Its Application to Amorphous GeSe Semiconductors

Terauchi, Hikaru; Tanabe, Kazuhiro; Kamijo, Nagao; Hida, Moritaka; Kawamura, Hikaru

doi:10.1143/jjap.21.1342

Cited by 41 publications

(8 citation statements)

References 19 publications

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“…They use HAPG, Highly Annealed Pyrolitic Graphite, which is a recently developed type of pyrolitic graphite, but with lower mosaicity needed for high spectral resolving power. This configuration is compared to the results from other authors [94,123,[210][211][212][213][214] and they find the HAPG spectrometer to have a higher efficiency and better resolving power. They report a resolving power of E=DE % 2000, being significantly lower that what can be achieved with synchrotron based techniques.…”

Section: Laboratory Based Von Hamos Type Spectrometersmentioning

confidence: 86%

Modern X-ray spectroscopy: XAS and XES in the laboratory

Zimmermann

Peredkov

Abdala

et al. 2020

Coordination Chemistry Reviews

161

140

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X-ray spectroscopy is an important tool for scientific analysis. While the earliest demonstration experiments were realised in the laboratory, with the advent of synchrotron light sources most of the experiments shifted to large scale synchrotron facilities. In the recent past there is an increased interest to perform X-ray experiments also with in-house laboratory sources, to simplify access to X-ray absorption and X-ray emission spectroscopy, in particular for routine measurements. Here we summarise the recent developments and comment on the most representative example experiments in the field of in-house laboratory X-ray spectroscopy. We first give an introduction and some historic background on X-ray spectroscopy. This is followed by an overview of the detection techniques used for X-ray absorption and X-ray emission measurements. A short paragraph also puts related high energy resolution and resonant techniques into context, though they are not yet feasible in the laboratory. At the end of this section the opportunities using wavelength dispersive X-ray spectroscopy in the laboratory are discussed. Then we summarise the relevant details of the recent experimental laboratory setups split into two separate sections, one for the recent von Hamos setups, and one for the recent Johann/Johansson type setups. Following that, focussing on chemistry and catalysis, we then summarise some of the notable X-ray absorption and X-ray emission experiments and the results accomplished with in-house setups. In a third part we then discuss some applications of laboratory X-ray spectroscopy with a particular focus on chemistry and catalysis.

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Section: Laboratory Based Von Hamos Type Spectrometersmentioning

confidence: 86%

Modern X-ray spectroscopy: XAS and XES in the laboratory

Zimmermann

Peredkov

Abdala

et al. 2020

Coordination Chemistry Reviews

161

140

View full text Add to dashboard Cite

show abstract

“…To eliminate these disadvantages we have utilized a dispersive method for EXAFS measurements. [17,18] Some of the most important advantages of this approach are: 1) The entire EXAFS spectrum of interest is recorded simultaneously. Therefore, fluctuations in the incident X-ray beam intensity do not influence the quality of the EXAFS spectrum.…”

Section: Time-resolved Exafsmentioning

confidence: 99%

Ultrafast Time‐Resolved Transient Structures of Solids and Liquids by Means of Extended X‐ray Absorption Fine Structure

Tomov

Rentzepis

2004

ChemPhysChem

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Detection of ultrafast transient structures and the evolution of ultrafast structural intermediates during the course of reactions has been a long standing goal of chemists and biologists. This article will be restricted to nanosecond, picosecond and shorter time-resolved extended X-ray absorption fine structure (EXAFS) studies, its aim being to present the progress and problems encounter in measurements and understanding the structure of transients. The recent advances in source technology has stimulated a wide variety of novel experiments using both synchrotrons and smaller laboratory size systems. With more efficient X-ray lenses and detectors many of the previously difficult experiments to perform, because of the exposure time required and weak signals, will now be easily performed. The experimental system for the detection of ultrafast, time-resolved EXAFS spectra of molecules in liquids is described and the method for the analysis of EXAFS spectra to yield transient structures is given. We believe that utilizing our table-top ultrafast X-ray source and the polycapillary optics in conjunction with dispersive spectrometer and charge coupled devices (CCD) we will be able to determine the structure of many reaction intermediates and excited states of chemical and biological molecules in solid and liquid state.

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“…To improve the resolution over symmetric reflection, the asymmetric reflection arrangement of Fig. 3 was used (Maeda, Terauchi, Tanabe, Kamijo, Hida & Kawamura, 1982) with the advantage that a given energy range is spread out further in space. This reduces the effect of the PSD on the energy resolution.…”

Section: B Reflection Geometrymentioning

confidence: 99%

Laboratory EXAFS in a dispersive mode

Buschert¹,

Giardina²,

Merlini³

et al. 1988

J Appl Cryst

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A laboratory dispersive mode spectrometer, capable of operating in either the analysing crystal transmission mode or a reflection mode, is described. Extended X-ray absorption fine structure (EXAFS) spectra of Re and ReO 2, obtained in the transmission mode, compare favourably with those from a scanning spectrometer at a synchrotron source. Factors affecting resolution, intensity and background in this transmission mode are discussed. Experiments with asymmetric reflection geometries, which have shown both improved resolution for X-ray absorption near edge structure (XANES) and reduced collection times, are reported. Methods of reducing backgrounds due to multiple Bragg reflections and Compton scattering are proposed.

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Development of a Laboratory EXAFS Facility and Its Application to Amorphous GeSe Semiconductors

Cited by 41 publications

References 19 publications

Modern X-ray spectroscopy: XAS and XES in the laboratory

Modern X-ray spectroscopy: XAS and XES in the laboratory

Ultrafast Time‐Resolved Transient Structures of Solids and Liquids by Means of Extended X‐ray Absorption Fine Structure

Laboratory EXAFS in a dispersive mode

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