scispace - formally typeset
Search or ask a question
Topic

XANES

About: XANES is a research topic. Over the lifetime, 7737 publications have been published within this topic receiving 188032 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, a revised assignment of the 5D energy level and transition intensity in YAG:Ce3+ is proposed. But the authors do not consider the effect of the host band gap on the luminosity of the emitted light.
Abstract: Ce3+-doped YAG nanoparticles have been synthesized at relatively low temperatures by the co-precipitation and polymer-assisted sol–gel methods and characterized by Fourier transform infrared spectroscopy (FT-IR), x-ray diffraction (XRD) and x-ray absorption near-edge structure (XANES) measurements. Calcination of the product was carried out at temperatures between 800 and 1100 °C. Products calcined at the lower temperature contained a greater proportion of Ce4+, and this contributed in part to the lower intensity of the characteristic yellow photoluminescence. The synchrotron radiation excitation spectrum of this yellow emission band exhibits bands due to Ce3+ absorption as well as the host band gap. The origin of a luminescence band at about 300 nm obtained under band-gap excitation is discussed. Previous assignments of the 5d electronic energies in YAG:Ce3+ are critically assessed, and in the light of the new energy level and transition intensity calculations a revised assignment is put forward for the 5d energy levels.

89 citations

Journal ArticleDOI
TL;DR: In this paper, X-ray absorption spectroscopy (XANES) at the tungsten LI and LIII absorption edges was used to identify the presence of W −O− and WO terminal bonds and a progressive apparition of W−O−W bridging bonds for the most WO3 concentrated samples (⩾30% molar).

88 citations

Journal ArticleDOI
TL;DR: In this paper, hydrogen chemisorption on small silica-supported Pt clusters was investigated using in situ extended X-ray absorption fine structure (EXAFS) spectroscopy and X-Ray absorption near-edge structure (XANES) spectrograms.
Abstract: Hydrogen chemisorption on small silica-supported Pt clusters was investigated using in situ extended X-ray absorption fine structure (EXAFS) spectroscopy and X-ray absorption near-edge structure (XANES) spectroscopy. The clusters were found to exhibit a bulklike Pt first nearest neighbor (NN) distance (2.76 A) and low disorder while covered by chemisorbed hydrogen. In contrast, bare Pt clusters produced by heating in vacuo at 300 °C are characterized by a contracted Pt NN distance (2.66 A) and greater disorder. These effects are reversed by re-exposure of the bare Pt clusters to H2 at 25 °C. The metal−support interface is characterized by a short Pt−O distance, irrespective of the presence of chemisorbed hydrogen. An apparent L3 edge shift of 0.8 eV relative to bulk Pt is observed for the hydrogen-covered clusters. This shift is attributed to a decrease in the Pt L3 edge resonance (white line) intensity, as no corresponding shift is observed at the L2 edge. A hydrogen-related L2,3 XANES feature at 9 eV ap...

88 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used synchrotron-based microscale X-ray absorption near edge structure spectroscopy (μ-XANES) to investigate Ge, Cu and Fe oxidation states in compositionally zoned Ge-rich sphalerite from the Saint-Salvy deposit (France).

88 citations

Journal ArticleDOI
TL;DR: In this paper, a series of molecular model compounds and grafted surface organometallic Ga species were synthesized and compared to those of gallium-based catalysts acquired under reducing conditions.

88 citations


Network Information
Related Topics (5)
Raman spectroscopy
122.6K papers, 2.8M citations
90% related
Oxide
213.4K papers, 3.6M citations
90% related
Adsorption
226.4K papers, 5.9M citations
88% related
Thin film
275.5K papers, 4.5M citations
87% related
Carbon nanotube
109K papers, 3.6M citations
87% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023186
2022403
2021212
2020232
2019242
2018256