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Extended X-ray absorption fine structure

About: Extended X-ray absorption fine structure is a research topic. Over the lifetime, 10452 publications have been published within this topic receiving 276744 citations.


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Journal ArticleDOI
TL;DR: In this paper, the local structure of vanadium (V) in synthetic glasses of basaltic composition has been studied by means of high-resolution V K-edge X-ray absorption near-edge structure (XANES) and extended Xray absorption Þ ne structure (EXAFS) spectroscopy to obtain quantitative data on distances, V coordination number, and oxidation state.
Abstract: The local structure of vanadium (V) in synthetic glasses of basaltic composition has been studied by means of high-resolution V K-edge X-ray absorption near-edge structure (XANES) and extended X-ray absorption Þ ne structure (EXAFS) spectroscopy to obtain quantitative data on distances, V coordination number (CN), and oxidation state. The compositions and experimental conditions were chosen so as to verify the effect of bulk-glass composition (using a diopside-anorthite composition, a sodium disilicate glass, and an iron-titanium-bearing basaltic glass) and V content (from 0.1 to 5 V2O5 wt%) on the structural role of V in these glasses. The combined analysis of high-resolution XANES spectra and EXAFS data indicate that on average, the Fe-free glasses synthesized in air show vanadium in the V 5+ state, mainly in tetrahedral coordination (less than 20% (5) V 5+ ) and with distances of 1.697 (± 0.020) A, in agreement with the values found for tetrahedral V in minerals. In contrast, the Fe-bearing basaltic glasses display a mixture of V 5+ in fourfold and Þ vefold coordination, 40% (4) V 5+ -60% (5) V 5+ in proportion, and the EXAFS-derived distances and coordination numbers are in agreement with this interpretation. No signiÞ cant changes in the V local structure were found in the glasses analyzed as a function of V-con- tents in the 0.1 to 5 V2O5 wt% range. The data obtained suggest that the structural role of vanadium in these melts is rather insensitive to bulk composition, in terms of V and alkali content, but can be strongly affected by the presence of other transition elements, e.g., Fe 3+ competing with V to enter the tetrahedral framework.

78 citations

Journal ArticleDOI
TL;DR: The data provide the first scattering-independent measurements of absorption coefficient in the spectral gap between well-established literature values for the absorption coefficients in the visible and UV, and a minimum in the absorption coefficient has been observed in the UV.
Abstract: Data for the spectral light absorption of pure water from 250 to 550 nm have been obtained using an integrating cavity made from a newly developed diffuse reflector with a very high UV reflectivity. The data provide the first scattering-independent measurements of absorption coefficients in the spectral gap between well-established literature values for the absorption coefficients in the visible (>400 nm) and UV (<200 nm). A minimum in the absorption coefficient has been observed in the UV at 344 nm; the value is 0.000811±0.000227 m−1.

78 citations

Journal ArticleDOI
TL;DR: The implementation of single-particle absorption spectroscopy on strongly scattering plasmonic nanoparticles is demonstrated by combining photothermal microscopy with a supercontinuum laser and an innovative calibration procedure that accounts for chromatic aberrations and wavelength-dependent excitation powers.
Abstract: Removing effects of sample heterogeneity through single-molecule and single-particle techniques has advanced many fields. While background free luminescence and scattering spectroscopy is widely used, recording the absorption spectrum only is rather difficult. Here we present an approach capable of recording pure absorption spectra of individual nanostructures. We demonstrate the implementation of single-particle absorption spectroscopy on strongly scattering plasmonic nanoparticles by combining photothermal microscopy with a supercontinuum laser and an innovative calibration procedure that accounts for chromatic aberrations and wavelength-dependent excitation powers. Comparison of the absorption spectra to the scattering spectra of the same individual gold nanoparticles reveals the blueshift of the absorption spectra, as predicted by Mie theory but previously not detectable in extinction measurements that measure the sum of absorption and scattering. By covering a wavelength range of 300 nm, we are furth...

78 citations

Journal ArticleDOI
TL;DR: In this paper, the S L- and Au L 3 -edge X-ray absorption fine structure and Xray photoelectron spectra of nanoscale Au-S products formed via the reduction of aqueous HAuCl 4 by sulfide ions and immobilized onto graphite have been acquired.

78 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023110
2022264
2021156
2020164
2019164
2018151