Angular momentum sum rules for x-ray absorption

1998 ◽  
Vol 57 (1) ◽  
pp. 112-115 ◽  
Author(s):  
Gerrit van der Laan
Keyword(s):  
Angular Momentum ◽  
Sum Rules ◽  
X Ray ◽  
X Ray Absorption

Sum rules for polarization-dependent x-ray absorption

1995 ◽  
Vol 51 (2) ◽  
pp. 1282-1285 ◽  
Author(s):  
A. Ankudinov ◽  
J. J. Rehr
Keyword(s):  
Sum Rules ◽  
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.

In situ XANES Study of Co2+ Ion Adsorption on Fe3O4 Nanoparticles in Supercritical Aqueous Fluids

2012 ◽  
Vol 1383 ◽  
Author(s):  
Hao Yan ◽  
Robert A. Mayanovic ◽  
Joseph Demster ◽  
Alan J. Anderson
Keyword(s):  
Angular Momentum ◽  
Density Of States ◽  
Fe3o4 Nanoparticles ◽  
Ion Adsorption ◽  
Edge Structure ◽  
X Ray ◽  
Peak Fitting ◽  
X Ray Absorption ◽  
In Situ Xanes

ABSTRACTIn situ x-ray absorption spectroscopy (XAS) measurements were made on Fe3O4 nanoparticles in supercritical aqueous fluids to 500 °C in order to study their reactivity with Co2+ aqua ions and to investigate the structural properties of the reacted nanoparticles. The analyses of the x-ray absorption near edge structure (XANES) of XAS indicate that reactivity of Fe3O4 nanoparticles with Co2+ ions is minimal to 200 °C but becomes significant in the 250–500 °C temperature range. XANES and angular momentum projected density of states (l-DOS) calculations were carried out using the FEFF8.2 code and analyses were made using multi-peak fitting to determine the origin of the features exhibited in the spectra.

X-ray-absorption sum rules injj-coupled operators and ground-state moments of actinide ions

1996 ◽  
Vol 53 (21) ◽  
pp. 14458-14469 ◽  
Author(s):  
Gerrit van der Laan ◽  
B. T. Thole
Keyword(s):  
Ground State ◽  
Sum Rules ◽  
X Ray ◽  
X Ray Absorption ◽  
Actinide Ions

Magnetic Dichroism in Resonant Photoemission and Photoabsorption from Gd Metal

1997 ◽  
Vol 475 ◽  
Author(s):  
K. Starke ◽  
G. Van Der Laan ◽  
Z. Hu ◽  
E. Arenholz ◽  
E. Navas ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Giant Resonance ◽  
High Surface ◽  
Magnetic Systems ◽  
X Ray ◽  
Resonant Photoemission ◽  
Excitation Region ◽  
Magnetic Dichroism ◽  
Consistent Picture ◽  
X Ray Absorption

ABSTRACTWe report on the study of MCD in resonant PE, using Gd metal as an example. When the photon energy is changed across the Gd 4d → 4ƒ excitation region, the PE-MCD spectrum varies substantially. Based on atomic-multiplet theory, we present a consistent picture of MCD in resonant 4d → 4ƒ PE and x-ray absorption at the 4d-edge, where all spectral changes can be explained by the angular-momentum of the intermediate absorption state. The present analysis shows: when tuning to a specific line of the 4d x-ray absorption spectrum with a total angular momentum J', only the associate multiplet component is found to resonate. At the ‘giant resonance’, the shape of the MCD-PE signal closely resembles the off-resonance case; this finding is explained within atomic-multiplet theory allowing a straightforward use of MCD in 4d-resonant PE (i) for element-specific analysis of multicomponent magnetic systems with high surface sensitivity and (ii) for surface-domain imaging by PE microscopy.

Spin-dependent sum rules for X-ray absorption spectra

2004 ◽  
Vol 66 (3) ◽  
pp. 441-447 ◽  
Author(s):  
A. L Ankudinov ◽  
J. J Rehr ◽  
H Wende ◽  
A Scherz ◽  
K Baberschke
Keyword(s):  
Absorption Spectra ◽  
Sum Rules ◽  
X Ray ◽  
X Ray Absorption

Normalization and convergence of x-ray absorption sum rules

2001 ◽  
Vol 63 (9) ◽  
Author(s):  
A. I. Nesvizhskii ◽  
A. L. Ankudinov ◽  
J. J. Rehr
Keyword(s):  
Sum Rules ◽  
X Ray ◽  
X Ray Absorption

X-ray microanalysis of thin specimens in the transmission electron microscope at voltages up to 1000 Kv.

1978 ◽  
Vol 36 (1) ◽  
pp. 540-541
Author(s):  
G. Cliff ◽  
M.J. Nasir ◽  
G.W. Lorimer ◽  
N. Ridley
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Weight Fraction ◽  
Present Series ◽  
Constant Independent ◽  
X Ray ◽  
Transmission Electron ◽  
Series Of Experiments ◽  
Image Position ◽  
X Ray Absorption

In a specimen which is transmission thin to 100 kV electrons - a sample in which X-ray absorption is so insignificant that it can be neglected and where fluorescence effects can generally be ignored (1,2) - a ratio of characteristic X-ray intensities, I1/I2 can be converted into a weight fraction ratio, C1/C2, using the equationwhere k12 is, at a given voltage, a constant independent of composition or thickness, k12 values can be determined experimentally from thin standards (3) or calculated (4,6). Both experimental and calculated k12 values have been obtained for K(11<Z>19),kα(Z>19) and some Lα radiation (3,6) at 100 kV. The object of the present series of experiments was to experimentally determine k12 values at voltages between 200 and 1000 kV and to compare these with calculated values.The experiments were carried out on an AEI-EM7 HVEM fitted with an energy dispersive X-ray detector.

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