scholarly journals High-resolution X-ray absorption spectroscopy of iron carbonyl complexes

2015 ◽  
Vol 17 (21) ◽  
pp. 13937-13948 ◽  
Author(s):  
Andrew J. Atkins ◽  
Matthias Bauer ◽  
Christoph R. Jacob
Keyword(s):  
High Resolution ◽  
Absorption Spectroscopy ◽  
Energy Resolution ◽  
High Energy ◽  
Iron Carbonyl ◽  
High Energy Resolution ◽  
Carbonyl Complexes ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption

We apply high-energy-resolution fluorescence-detected (HERFD) X-ray absorption near-edge structure (XANES) spectroscopy to study iron carbonyl complexes.

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 Wetting Induced Oxidation of Pt-based Nano Catalysts Revealed by In Situ High Energy Resolution X-ray Absorption Spectroscopy

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Yi-Tao Cui ◽  
Yoshihisa Harada ◽  
Hideharu Niwa ◽  
Tatsuya Hatanaka ◽  
Naoki Nakamura ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
X Ray ◽  
Nano Catalysts ◽  
X Ray Absorption

High energy resolution x-ray absorption spectroscopy study of uranium in varying valence states

2010 ◽  
Vol 82 (23) ◽  
Author(s):  
T. Vitova ◽  
K. O. Kvashnina ◽  
G. Nocton ◽  
G. Sukharina ◽  
M. A. Denecke ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
Spectroscopy Study ◽  
X Ray ◽  
Valence States ◽  
X Ray Absorption

Experimental and Theoretical High-Energy-Resolution X-ray Absorption Spectroscopy: Implications for the Investigation of the Entatic State

2016 ◽  
Vol 55 (22) ◽  
pp. 11694-11706 ◽  
Author(s):  
Nora Jenny Vollmers ◽  
Patrick Müller ◽  
Alexander Hoffmann ◽  
Sonja Herres-Pawlis ◽  
Martin Rohrmüller ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
X Ray ◽  
Entatic State ◽  
X Ray Absorption
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