The molybdenum site of sulfite oxidase. Structural information from x-ray absorption spectroscopy

1979 ◽  
Vol 101 (10) ◽  
pp. 2772-2774 ◽  
Author(s):  
Stephen P. Cramer ◽  
Harry B. Gray ◽  
K. V. Rajagopalan
Keyword(s):  
Absorption Spectroscopy ◽  
Structural Information ◽  
Sulfite Oxidase ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Extracting structural information of Au colloids at ultra-dilute concentrations: identification of growth during nanoparticle immobilization

2019 ◽  
Vol 1 (7) ◽  
pp. 2546-2552 ◽  
Author(s):  
George F. Tierney ◽  
Donato Decarolis ◽  
Norli Abdullah ◽  
Scott M. Rogers ◽  
Shusaku Hayama ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Structural Characterization ◽  
Structural Information ◽  
Particle Growth ◽  
Au Nanoparticle ◽  
X Ray ◽  
Colloidal Au ◽  
X Ray Absorption ◽  
Au Colloids

This paper describes the structural characterization of ultra-dilute colloidal Au nanoparticle solutions using X-ray absorption spectroscopy (XAS) and the particle growth during immobilization.

scholarly journals Simultaneous two-color X-ray absorption spectroscopy using Laue crystals at an inverse-compton scattering X-ray facility

2021 ◽  
Vol 28 (6) ◽  
Author(s):  
Juanjuan Huang ◽  
Benedikt Günther ◽  
Klaus Achterhold ◽  
Martin Dierolf ◽  
Franz Pfeiffer
Keyword(s):  
Compton Scattering ◽  
Absorption Spectroscopy ◽  
Bimetallic Catalyst ◽  
Structural Information ◽  
Synergistic Effects ◽  
Edge Structure ◽  
X Ray ◽  
Inverse Compton Scattering ◽  
Inverse Compton ◽  
X Ray Absorption

X-ray absorption spectroscopy (XAS) is an element-selective technique that provides electronic and structural information of materials and reveals the essential mechanisms of the reactions involved. However, the technique is typically conducted at synchrotrons and usually only probes one element at a time. In this paper, a simultaneous two-color XAS setup at a laboratory-scale synchrotron facility is proposed based on inverse Compton scattering (ICS) at the Munich Compact Light Source (MuCLS), which is based on inverse Compton scattering (ICS). The setup utilizes two silicon crystals in a Laue geometry. A proof-of-principle experiment is presented where both silver (Ag) and palladium (Pd) K-edge X-ray absorption near-edge structure spectra were simultaneously measured. The simplicity of the setup facilitates its migration to other ICS facilities or maybe to other X-ray sources (e.g. a bending-magnet beamline). Such a setup has the potential to study reaction mechanisms and synergistic effects of chemical systems containing multiple elements of interest, such as a bimetallic catalyst system.

X-ray Absorption Spectroscopy of Chicken Sulfite Oxidase Crystals

1999 ◽  
Vol 38 (10) ◽  
pp. 2539-2540 ◽  
Author(s):  
Graham N. George ◽  
Ingrid J. Pickering ◽  
Caroline Kisker
Keyword(s):  
Absorption Spectroscopy ◽  
Sulfite Oxidase ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Comparative Experimental Study of X-Ray Absorption Spectroscopy and Electron Energy Loss Spectroscopy on Passivated U Surfaces

2006 ◽  
Vol 986 ◽  
Author(s):  
Art J. Nelson ◽  
W. J. Moberlychan ◽  
R. A. Bliss ◽  
W. J. Siekhaus ◽  
T. E. Felter ◽  
...  
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Absorption Spectroscopy ◽  
Electron Energy Loss Spectroscopy ◽  
Structural Information ◽  
Analytical Techniques ◽  
Initial State ◽  
X Ray ◽  
Electron Energy Loss ◽  
X Ray Absorption

AbstractX-ray absorption spectroscopy and electron energy loss spectroscopy are complementary analytical techniques on energy and spatial resolution. These techniques are based on the same fundamental physical process of core excitation with either an incident photon or incident electron. In the proper experimental configuration the electron and photon inelastic scattering amplitudes are comparable and thus the x-ray and electron absorption edges look identical. We have applied these two complementary analytical techniques to investigate the electronic structure of C ion implanted U. Implantation of C+ ions into U238 has been shown to produce a physically and chemically modified surface layer that passivates the surface preventing further air oxidation and corrosion. Comparison of the resultant spectra reveal that transitions between the initial state and a series of final states yield numerous strong features at the absorption edge that can provide structural information and information on the local chemical environment, including the character of the U 5f state.

Structure of the active site of sulfite oxidase. X-ray absorption spectroscopy of the molybdenum(IV), molybdenum(V), and molybdenum(VI) oxidation states

Biochemistry ◽  
1989 ◽  
Vol 28 (12) ◽  
pp. 5075-5080 ◽  
Author(s):  
Graham N. George ◽  
Cary A. Kipke ◽  
Roger C. Prince ◽  
Roger A. Sunde ◽  
John H. Enemark ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Active Site ◽  
Sulfite Oxidase ◽  
Oxidation States ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Selenium Valence-to-Core X-ray Emission Spectroscopy and Kβ HERFD X-ray Absorption Spectroscopy as Complementary Probes of Chemical and Electronic Structure

2021 ◽  
Author(s):  
Justin T. Henthorn ◽  
Serena DeBeer
Keyword(s):  
Absorption Spectroscopy ◽  
Emission Spectroscopy ◽  
Active Sites ◽  
Structural Information ◽  
Oxidation States ◽  
Geochemical Processes ◽  
X Ray ◽  
Fe Oxidation ◽  
Experimental Resolution ◽  
X Ray Absorption

Selenium X-ray absorption spectroscopy (XAS) has found widespread use in investigations of Se-containing materials, geochemical processes, and biological active sites. In contrast to sulfur Kβ X-ray emission spectroscopy (XES), which has been found to contain electronic and structural information complementary to S XAS, Se Kβ XES remains comparatively under-explored. Herein, we present the first Se Valence-to-Core (VtC) XES studies of reduced Se-containing compounds and FeSe dimers. Se VtC XES is found to be sensitive to changes in covalent Se bonding interactions (Se–Se/Se–C/Se–H bonding) while relatively insensitive to changes in Fe oxidation states as selenide bridges in FeSe dimers ([Fe2Se2]2+ vs [Fe2Se2]+). Contrastingly, Se Kβ HERFD XAS is demonstrated to be quite sensitive to changes in Fe-oxidation state, with Se Kβ HERFD XAS demonstrating experimental resolution equivalent to K𝛼 HERFD XAS. Additionally, computational studies reveal both Se VtC XES and XAS to be sensitive to selenium protonation in FeSe complexes.

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