Vanadium K-edge X-ray absorption spectrum of the VFe protein of the vanadium nitrogenase of Azotobacter chroococcum

Nature ◽  
1987 ◽  
Vol 325 (6102) ◽  
pp. 372-374 ◽  
Author(s):  
Judith M. Arber ◽  
Barry R. Dobson ◽  
Robert R. Eady ◽  
Philippe Stevens ◽  
S. Samar Hasnain ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Azotobacter Chroococcum ◽  
X Ray ◽  
Vanadium Nitrogenase ◽  
X Ray Absorption

scholarly journals Vanadium K-edge X-ray-absorption spectroscopy of the functioning and thionine-oxidized forms of the VFe-protein of the vanadium nitrogenase from Azotobacter chroococcum

1989 ◽  
Vol 258 (3) ◽  
pp. 733-737 ◽  
Author(s):  
J M Arber ◽  
B R Dobson ◽  
R R Eady ◽  
S S Hasnain ◽  
C D Garner ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Absorption Spectroscopy ◽  
Azotobacter Chroococcum ◽  
Vanadium Atom ◽  
Oxidation States ◽  
Edge Structure ◽  
X Ray ◽  
Vanadium Nitrogenase ◽  
Enzyme Turnover ◽  
X Ray Absorption

Vanadium K-edge X-ray-absorption spectra were collected for samples of thionine-oxidized, super-reduced (during enzyme turnover) and dithionite-reduced VFe-protein of the vanadium nitrogenase of Azotobacter chroococcum (Acl*). Both the e.x.a.f.s and the x.a.n.e.s. (X-ray-absorption near-edge structure) are consistent with the vanadium being present as part of a VFeS cluster; the environment of the vanadium is not changed significantly in different oxidation states of the protein. The vanadium atom is bound to three oxygen (or nitrogen), three sulphur and three iron atoms at 0.215(3), 0.231(3) and 0.275(3) nm respectively.

107. Anisotropy effects in the linearly polarized X-ray absorption spectrum of Br2 intercalated graphite fibers and HOPG

Carbon ◽  
1984 ◽  
Vol 22 (2) ◽  
pp. 216
Author(s):  
J.L Feldman ◽  
E.F Skelton ◽  
A.C Ehrlich ◽  
D.D Dominguez ◽  
W.T Elam ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
X Ray ◽  
Intercalated Graphite ◽  
Linearly Polarized ◽  
Graphite Fibers ◽  
X Ray Absorption

Quantum confinement observed in the x-ray absorption spectrum of size distributed meteoritic nanodiamonds

2008 ◽  
Vol 104 (6) ◽  
pp. 064303 ◽  
Author(s):  
Thomas Berg ◽  
Edit Marosits ◽  
Jochen Maul ◽  
Peter Nagel ◽  
Ulrich Ott ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Quantum Confinement ◽  
X Ray ◽  
X Ray Absorption

scholarly journals L-edge sum rule analysis on 3d transition metal sites: from d10to d0and towards application to extremely dilute metallo-enzymes

2018 ◽  
Vol 20 (12) ◽  
pp. 8166-8176 ◽  
Author(s):  
Hongxin Wang ◽  
Stephan Friedrich ◽  
Lei Li ◽  
Ziliang Mao ◽  
Pinghua Ge ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Transition Metal ◽  
Metal Complex ◽  
Sum Rules ◽  
Sum Rule ◽  
X Ray ◽  
Metal Site ◽  
Integrated Intensity ◽  
Rule Analysis ◽  
X Ray Absorption

According to L-edge sum rules, the number of 3d vacancies at a transition metal site is directly proportional to the integrated intensity of the L-edge X-ray absorption spectrum (XAS) for the corresponding metal complex.

X-Ray Absorption Fine Structure Study in FeTiO3

1997 ◽  
Vol 11 (16n17) ◽  
pp. 745-748 ◽  
Author(s):  
Rebekah Min-Fang Hsu ◽  
Kai-Jan Lin ◽  
Cheng Tien ◽  
Lin-Yan Jang
Keyword(s):  
Absorption Spectrum ◽  
Fine Structure ◽  
Absorption Spectra ◽  
Mixed Valence ◽  
Structure Study ◽  
X Ray ◽  
Xafs Spectroscopy ◽  
Absorption Fine ◽  
Trivalent State ◽  
X Ray Absorption

X-ray absorption fine structure XAFS spectroscopy has been used to determine the valence system for the Fe atom in ilmenite, FeTiO3 . This is the first XAFS data in FeTiO3 to our knowledge. The α- Fe2O3 data served as the standard in determining the ionization of the Fe atom in FeTiO3 . Observation of intensity and k-space are consistent. There was no evidence of mixed valence on comparing the FeTiO3 near edge X-ray absorption spectrum with α- Fe2O3 data. The absorption spectra suggest that iron is in the trivalent state in ilmenite.

Establishment and Application of Testing Method for Fluorescence Based Soft X-Ray Absorption Spectrum

2019 ◽  
Vol 39 (3) ◽  
pp. 0330002 ◽  
Author(s):  
陈振华 Chen Zhenhua ◽  
李俊琴 Li Junqin ◽  
赵子龙 Zhao Zilong ◽  
桑卓成 Sang Zhuocheng ◽  
邹鹰 Zou Ying ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
X Ray ◽  
Testing Method ◽  
X Ray Absorption

scholarly journals Glitch-free X-ray absorption spectrum under high pressure obtained using nano-polycrystalline diamond anvils

2012 ◽  
Vol 19 (5) ◽  
pp. 768-772 ◽  
Author(s):  
Naoki Ishimatsu ◽  
Ken Matsumoto ◽  
Hiroshi Maruyama ◽  
Naomi Kawamura ◽  
Masaichiro Mizumaki ◽  
...  
Keyword(s):  
High Pressure ◽  
Absorption Spectrum ◽  
Polycrystalline Diamond ◽  
X Ray ◽  
Diamond Anvils ◽  
X Ray Absorption

Transitions to Optical Levels in the Argon L X-Ray Absorption Spectrum

Nature ◽  
1934 ◽  
Vol 133 (3369) ◽  
pp. 795-796 ◽  
Author(s):  
J. A. PRINS
Keyword(s):  
Absorption Spectrum ◽  
X Ray ◽  
X Ray Absorption
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