In situ observation of charge transfer and crystal field formation via high energy resolution X-ray spectroscopy during temperature programmed oxidation

2020 ◽  
Vol 22 (26) ◽  
pp. 14731-14735
Author(s):  
Anna Wach ◽  
Wojciech Błachucki ◽  
Joanna Czapla-Masztafiak ◽  
Daniel Luis Abreu Fernandes ◽  
Dariusz Banaś ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
In Situ Observation ◽  
X Ray ◽  
Temperature Programmed Oxidation ◽  
Temperature Programmed ◽  
Charge Transfer Dynamics ◽  
Field Formation

In this paper, we demonstrated how high energy resolution resonant X-ray emission spectroscopy can be employed to study the charge transfer dynamics in real-time during the temperature-induced oxidation of metallic tungsten.

Mn 2p resonant X-ray emission clarifies the redox reaction and charge-transfer effects in LiMn2O4

2019 ◽  
Vol 21 (33) ◽  
pp. 18363-18369 ◽  
Author(s):  
Daisuke Asakura ◽  
Yusuke Nanba ◽  
Eiji Hosono ◽  
Masashi Okubo ◽  
Hideharu Niwa ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Charge Transfer ◽  
Energy Resolution ◽  
Emission Spectroscopy ◽  
High Energy ◽  
High Energy Resolution ◽  
Transfer Effects ◽  
X Ray ◽  
Ion Extraction ◽  
Li Ion

High-energy-resolution soft X-ray emission spectroscopy (XES) was applied to understand the changes in the electronic structure of LiMn2O4 upon Li-ion extraction/insertion.

scholarly journals Probing CuI in homogeneous catalysis using high-energy-resolution fluorescence-detected X-ray absorption spectroscopy

2015 ◽  
Vol 51 (48) ◽  
pp. 9864-9867 ◽  
Author(s):  
Richard C. Walroth ◽  
Jacob W. H. Uebler ◽  
Kyle M. Lancaster
Keyword(s):  
Charge Transfer ◽  
Homogeneous Catalysis ◽  
Energy Resolution ◽  
Catalytic Reaction ◽  
High Energy ◽  
High Energy Resolution ◽  
X Ray ◽  
Ligand Charge Transfer ◽  
X Ray Absorption ◽  
Absorption Features

CuI X-ray absorption features are assigned as metal-to-ligand charge transfer bands. These features facilitate species identification in catalytic reaction mixtures.

scholarly journals High-Energy-Resolution Fluorescence-Detected X-ray Absorption of the Q Intermediate of Soluble Methane Monooxygenase

2017 ◽  
Vol 139 (49) ◽  
pp. 18024-18033 ◽  
Author(s):  
Rebeca G. Castillo ◽  
Rahul Banerjee ◽  
Caleb J. Allpress ◽  
Gregory T. Rohde ◽  
Eckhard Bill ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Methane Monooxygenase ◽  
High Energy ◽  
High Energy Resolution ◽  
X Ray ◽  
Soluble Methane Monooxygenase ◽  
X Ray Absorption

scholarly journals High-energy resolution X-ray absorption and emission spectroscopy reveals insight into unique selectivity of La-based nanoparticles for CO2

2015 ◽  
Vol 112 (52) ◽  
pp. 15803-15808 ◽  
Author(s):  
Ofer Hirsch ◽  
Kristina O. Kvashnina ◽  
Li Luo ◽  
Martin J. Süess ◽  
Pieter Glatzel ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Emission Spectroscopy ◽  
High Energy ◽  
Unit Cell ◽  
High Energy Resolution ◽  
Electron Configuration ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption

The lanthanum-based materials, due to their layered structure and f-electron configuration, are relevant for electrochemical application. Particularly, La2O2CO3 shows a prominent chemoresistive response to CO2. However, surprisingly less is known about its atomic and electronic structure and electrochemically significant sites and therefore, its structure–functions relationships have yet to be established. Here we determine the position of the different constituents within the unit cell of monoclinic La2O2CO3 and use this information to interpret in situ high-energy resolution fluorescence-detected (HERFD) X-ray absorption near-edge structure (XANES) and valence-to-core X-ray emission spectroscopy (vtc XES). Compared with La(OH)3 or previously known hexagonal La2O2CO3 structures, La in the monoclinic unit cell has a much lower number of neighboring oxygen atoms, which is manifested in the whiteline broadening in XANES spectra. Such a superior sensitivity to subtle changes is given by HERFD method, which is essential for in situ studying of the interaction with CO2. Here, we study La2O2CO3-based sensors in real operando conditions at 250 °C in the presence of oxygen and water vapors. We identify that the distribution of unoccupied La d-states and occupied O p- and La d-states changes during CO2 chemoresistive sensing of La2O2CO3. The correlation between these spectroscopic findings with electrical resistance measurements leads to a more comprehensive understanding of the selective adsorption at La site and may enable the design of new materials for CO2 electrochemical applications.

scholarly journals Chemical State Mapping via Soft X-rays using a Wavelength Dispersive Soft X-ray Emission Spectrometer with High Energy Resolution

2013 ◽  
Vol 19 (S2) ◽  
pp. 1258-1259 ◽  
Author(s):  
H. Takahashi ◽  
N. Handa ◽  
T. Murano ◽  
M. Terauchi ◽  
M. Koike ◽  
...  
Keyword(s):  
Energy Resolution ◽  
High Energy ◽  
Chemical State ◽  
High Energy Resolution ◽  
X Rays ◽  
X Ray

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

X‐ray fluorescence analysis with high energy resolution

1996 ◽  
Vol 67 (9) ◽  
pp. 3359-3359 ◽  
Author(s):  
Wolfgang A. Caliebe ◽  
Sas̆a Bajt ◽  
Chi‐Chang Kao
Keyword(s):  
Energy Resolution ◽  
Fluorescence Analysis ◽  
High Energy ◽  
High Energy Resolution ◽  
X Ray

High energy resolution PIXE spectroscopy at the J. Stefan Institute, Ljubljana

2014 ◽  
Vol 24 (03n04) ◽  
pp. 205-215
Author(s):  
M. Kavčič
Keyword(s):  
Trace Element ◽  
Energy Resolution ◽  
Trace Element Analysis ◽  
High Energy ◽  
Energy Dispersive ◽  
High Energy Resolution ◽  
Pixe Analysis ◽  
X Ray ◽  
Analytical Technique ◽  
Stefan Institute

While traditional proton induced X-ray emission (PIXE) analytical technique is based on the energy dispersive solid state detectors used to collect the X-ray fluorescence from the sample, wavelength dispersive X-ray (WDX) spectrometers are applied in high energy resolution PIXE (HR-PIXE) analysis. The main drawback of the WDX spectroscopy is the relatively low efficiency making it less applicable for trace element PIXE analysis. However, the efficiency was enhanced significantly in modern spectrometers employing cylindrically or even spherically curved crystals combined with position sensitive X-ray detectors. The energy resolution of such a spectrometer may exceed the resolution of the energy dispersive detector by two orders of magnitude while keeping the efficiency at a high enough level to perform trace element analysis. In this paper, the recent history and the development of HR-PIXE spectroscopy at the J. Stefan Institute in Ljubljana is presented. Our current setup based on in-vacuum Johansson-type crystal spectrometer is presented in more details followed by some most recent applications.

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