Extended x-ray absorption fine structure investigations of nickel hydroxides

1990 ◽  
Vol 94 (1) ◽  
pp. 21-26 ◽  
Author(s):  
K. I. Pandya ◽  
W. E. O'Grady ◽  
D. A. Corrigan ◽  
J. McBreen ◽  
R. W. Hoffman
Keyword(s):  
Fine Structure ◽  
X Ray ◽  
Absorption Fine ◽  
Structure Investigations ◽  
X Ray Absorption

Near-Edge X-ray Absorption Fine Structure Investigations of Order in Carbon Nanotube-Based Systems†

2005 ◽  
Vol 109 (17) ◽  
pp. 8489-8495 ◽  
Author(s):  
Sarbajit Banerjee ◽  
Tirandai Hemraj-Benny ◽  
Sharadha Sambasivan ◽  
Daniel A. Fischer ◽  
James A. Misewich ◽  
...  
Keyword(s):  
Fine Structure ◽  
Carbon Nanotube ◽  
X Ray ◽  
Absorption Fine ◽  
Structure Investigations ◽  
X Ray Absorption

New Opportunities to Study Defects by Soft X-Ray Absorption Fine Structure

2007 ◽  
Vol 131-133 ◽  
pp. 473-478
Author(s):  
Federico Boscherini ◽  
D. De Salvador ◽  
G. Bisognin ◽  
G. Ciatto
Keyword(s):  
Fine Structure ◽  
Local Structure ◽  
Light Elements ◽  
Semiconductor Physics ◽  
X Ray ◽  
Absorption Fine ◽  
Radiation Sources ◽  
Structure Investigations ◽  
X Ray Absorption ◽  
Semiconductor Properties

X-ray absorption fine structure can determine the local structure of most atoms in the periodic table. The great recent improvements in the performance of synchrotron radiation sources and techniques and advances in the simulations of the spectra have opened new opportunities, especially in the study of dilute systems in the soft X-ray range. In this contribution we will show some recent results that demonstrate how semiconductor physics may greatly benefit from such progress. In fact, doping or alloying of semiconductors with light elements, that have K absorption edges in the soft X-ray range, is widely employed to tune semiconductor properties. X-ray absorption fine structure investigations on such systems can give an important contribution towards the understanding and optimization of technological processes.

scholarly journals Extended-X-ray-absorption-fine-structure investigations of zinc in 5-aminolaevulinate dehydratase

1985 ◽  
Vol 230 (3) ◽  
pp. 625-633 ◽  
Author(s):  
S S Hasnain ◽  
E M Wardell ◽  
C D Garner ◽  
M Schlösser ◽  
D Beyersmann
Keyword(s):  
Fine Structure ◽  
Nitrogen Atom ◽  
Molecular Mass ◽  
Thiol Groups ◽  
Air Oxidation ◽  
X Ray ◽  
Absorption Fine ◽  
Catalytic Role ◽  
Structure Investigations ◽  
X Ray Absorption

The zinc co-ordination in 5-aminolaevulinate dehydratase (5-aminolaevulinate hydro-lyase, EC 4.2.1.24) was investigated by recording and interpreting the extended X-ray-absorption fine structure (e.x.a.f.s.) associated with the zinc K-edge. The enzyme has a molecular mass of 280 000 Da and consists of eight subunits of 35 000 Da each; the samples studied contained approx. 1 g-atom of zinc/mol of subunit. Four forms of the enzyme were investigated and details of the zinc environment were elucidated, as follows. In the native enzyme, zinc is considered to be co-ordinated to three sulphur atoms at 0.228(2)nm [2.28(2)A] and a lower-Z atom at 0.192(5)nm [1.92(5)A] (if nitrogen) or 0.189(5)nm [1.89(5)A] (if oxygen). Reaction of the enzyme with the inhibitor 2-bromo-3-(imidazol-5-yl)propionic acid produced significant changes in the e.x.a.f.s., the nature of which are consistent with co-ordination by about three sulphur atoms at 0.222(2)nm [2.22(2)A], a nitrogen atom at 0.193(5)nm [1.93(5)A] and a nitrogen atom from the inhibitor at 0.214(5)nm [2.14(5)A]. Inactivation of the enzyme by air-oxidation of essential thiol groups and binding of the substrate produce slight changes in the e.x.a.f.s. consistent with slight re-arrangement of ligands with additional lighter ligands (nitrogen or oxygen). These results, when combined with previous findings, are taken to indicate that zinc has a structural rather than a direct catalytic role in 5-aminolaevulinate dehydratase.

X-ray absorption fine structure investigations on heat-treated Cr-doped titania thin films

2011 ◽  
Vol 520 (4) ◽  
pp. 1348-1352 ◽  
Author(s):  
Diana Mardare ◽  
Valentin Nica ◽  
Valentin Pohoata ◽  
Dan Macovei ◽  
Nicoleta Gheorghe ◽  
...  
Keyword(s):  
Thin Films ◽  
Fine Structure ◽  
X Ray ◽  
Absorption Fine ◽  
Heat Treated ◽  
Doped Titania ◽  
Structure Investigations ◽  
X Ray Absorption

Structure of magnetic thin films and nanostructures studied by extended X-ray absorption fine structure

2000 ◽  
Vol 454-456 ◽  
pp. 723-728 ◽  
Author(s):  
H. Magnan ◽  
P. Le Fèvre ◽  
A. Midoir ◽  
D. Chandesris ◽  
H. Jaffrès ◽  
...  
Keyword(s):  
Thin Films ◽  
Fine Structure ◽  
Magnetic Thin Films ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption
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