A new technique to measure the differential XAFS spectrum

Wu, Min; Zheng, Lirong; Chu, Shengqi; Zhou, Ai; Zhang, Jing; Hu, Tiandou

doi:10.1088/1674-1137/40/4/048001

Cited by 2 publications

(1 citation statement)

References 13 publications

(14 reference statements)

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“…In 2001, an energy modulation technique for XAFS spectroscopy was first developed (Suzuki et al 2001) and an energy-derivative x-ray absorption near-edge structure spectrum was obtained. In recent years, Min Wu et al developed the energy modulation technique (Wu et al 2016) to acquire the differential XAFS spectra. Work by former researchers focus on the data collection procedure, which has the advantage of getting differential XAFS data directly.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Extracting structural information of higher coordination shells by analyzing EXAFS derivative spectrum

Chen¹,

Chu²,

Zhou³

et al. 2018

Phys. Scr.

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A method has been developed for analyzing the extended x-ray absorption fine structure (EXAFS) derivative spectrum. Taking Fourier transform to EXAFS derivative spectrum data can enhance the signal of high coordination shells. The EXAFS spectroscopy of high-purity Ge powder is taken as an example to present the whole data processing procedure. Through the comparison of the pair distribution function approach and the normal EXAFS analysis, we confirm the reasonableness and the effectiveness of the method. Particularly, this EXAFS derivative method may be a useful tool for studying the relatively high coordination shells in materials.

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Section: Analysis and Discussionmentioning

confidence: 99%

Extracting structural information of higher coordination shells by analyzing EXAFS derivative spectrum

Chen¹,

Chu²,

Zhou³

et al. 2018

Phys. Scr.

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The changes of chromium speciation in limestone samples during simulated natural attenuation processes

Zhao

Zhang

Liu

et al. 2022

Preprint

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To study the Cr(VI) natural attenuation processes, Cr(VI) diffusion-reaction experiments for limestone samples were conducted. After experiments, synchrotron radiation µ-XRF maps showed that for organic-rich limestone samples, most of Cr distributed close to the surface, and some high Cr spots were found to be associated with organic matters; whereas, Cr distributed evenly in the samples containing low organic matter. These results indicate that Cr(VI) reacts with organic matter in the fractures and pore space of organic-rich limestone samples, and the reducing products (Cr(III) precipitates) might aggregate and block the pore throats, which might retard the further diffusion of Cr(VI) into the rock matrix. The distributions of Cr chemical forms, which were obtained by X-ray absorption near-edge structure (XANES) spectroscopy, showed that for organic-rich limestone samples, the Cr(OH)3 fraction in the center was higher than that on the surface, whereas, for the samples containing low organic matter, no such significant difference was found. One possible explanation for these findings is that in organic-rich limestone samples, the Cr(III) hydroxides, which aggregate in the zones close to the surface, might age and transform from crystalline to the stable chemical forms of Cr(III) oxyhydroxide or even Cr(III) oxides, which could enhance the effect of Cr(VI) natural attenuation. By using synchrotron radiation based techniques, this work provides a feasible way to investigate the changes of chromium chemical forms during its diffusion-reaction processes in rock samples and can be used to study the mechanism of Cr(VI) natural attenuation.

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A new technique to measure the differential XAFS spectrum

Abstract: A new technique to measure the differential XAFS spectrum) 1 Jing Zhang( ) 1 Tian-Dou Hu( ) 1;1)

Cited by 2 publications

References 13 publications

Extracting structural information of higher coordination shells by analyzing EXAFS derivative spectrum

Extracting structural information of higher coordination shells by analyzing EXAFS derivative spectrum

The changes of chromium speciation in limestone samples during simulated natural attenuation processes

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