Chemical microanalysis by x‐ray microscopy near absorption edge with synchrotron radiation

1977 ◽  
Vol 31 (11) ◽  
pp. 785-787 ◽  
Author(s):  
F. Polack ◽  
S. Lowenthal ◽  
Y. Petroff ◽  
Y. Farge
Keyword(s):  
Synchrotron Radiation ◽  
Absorption Edge ◽  
X Ray

A method to stabilize the incident X-ray energy for anomalous diffraction measurements

2017 ◽  
Vol 24 (4) ◽  
pp. 781-786
Author(s):  
Wenjia Wang ◽  
Xiaoyun Yang ◽  
Guangcai Chang ◽  
Pengfei An ◽  
Kewen Cha ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Data Collection ◽  
Absorption Edge ◽  
Feedback Loop ◽  
Inflection Point ◽  
Single Crystal Diffraction ◽  
Double Crystal ◽  
Anomalous Diffraction ◽  
X Ray ◽  
Double Crystal Monochromator

A method to calibrate and stabilize the incident X-ray energy for anomalous diffraction data collection is provided and has been successfully used at the single-crystal diffraction beamline 1W2B at the Beijing Synchrotron Radiation Facilities. Employing a feedback loop to control the movement of the double-crystal monochromator, this new method enables the incident X-ray energy to be kept within a 0.2 eV range at the inflection point of the absorption edge.

scholarly journals X-Ray Microscopy Using Collimated and Focussed Synchrotron Radiation*

1987 ◽  
Vol 31 ◽  
pp. 59-68 ◽  
Author(s):  
K. W. Jones ◽  
W. M. Kwiatek ◽  
B. M. Gordon ◽  
A. L. Hanson ◽  
J. G. Pounds ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Absorption Edge ◽  
Periodic Table ◽  
Small Diameter ◽  
Biological Materials ◽  
X Rays ◽  
X Ray ◽  
Zone Plates ◽  
Elemental Maps

X-ray microscopy is a field that has developed rapidly in recent years. Two different approaches have been used. Zone plates have been employed to produce focussed beams with sizes as low as 0.07 pm for x-ray energies below 1 keV. Images of biological materials and elemental maps for major and minor low Z have been produced using above and below absorption edge differences. At higher energies collimators and focussing mirrors have been used to make small diameter beams for excitation of characteristic K— or L-x rays of all elements in the periodic table.

Development of X-ray photoemission electron microscopy (X-PEEM) at the SRS

1998 ◽  
Vol 5 (3) ◽  
pp. 1108-1110 ◽  
Author(s):  
A. D. Smith ◽  
G. Cressey ◽  
P. F. Schofield ◽  
B. A. Cressey
Keyword(s):  
Electron Microscopy ◽  
Iron Oxide ◽  
Synchrotron Radiation ◽  
Absorption Edge ◽  
Single Phase ◽  
Photoemission Electron Microscopy ◽  
X Ray ◽  
Limited Availability ◽  
Radiation Sources ◽  
Photoemission Electron

The use of synchrotron radiation sources for X-ray spectroscopy is a well known and developed field. The majority of applications, however, have been limited to studies of materials containing only a single phase of the element of interest. Owing to limited availability of suitable instrumentation, the study of materials comprising intergrowths of different phases has presented difficulties in analysis. The majority of natural materials, including mineralogical samples, fall into this category. However, by applying the technique of photoemission electron microscopy (PEEM) to view the X-ray stimulated photoemission generated at an absorption edge, micro-area-selectable spectroscopy becomes possible. An instrument for X-ray PEEM (X-PEEM) is being developed at the Daresbury SRS and this paper shows how it can be used to obtain characteristic L-edge XANES spectra from finely intergrown iron oxide minerals.

Measurements of X-Ray Anomalous Scattering Factors near the Cu K Absorption Edge by the Use of Synchrotron Radiation

1978 ◽  
Vol 17 (S2) ◽  
pp. 326 ◽  
Author(s):  
Tomoe Fukamachi ◽  
Sukeaki Hosoya ◽  
Takaaki Kawamura ◽  
Sally Hunter ◽  
Yuji Nakano
Keyword(s):  
Synchrotron Radiation ◽  
Absorption Edge ◽  
Anomalous Scattering ◽  
X Ray

Experimental evidence for onset of L1–L3M5 transition at Z = 75 through measurements of fluorescence and Coster–Kronig yields for W and Re

2021 ◽  
Author(s):  
Vibha Ayri ◽  
Sandeep Kaur ◽  
Anil Kumar ◽  
M. Czyzycki ◽  
A. G. Karydas ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Experimental Evidence ◽  
Absorption Edge ◽  
X Ray ◽  
Line Intensities ◽  
Radiation Induced

L shell fluorescence and Coster–Kronig yields for W and Re were deduced from synchrotron radiation induced X-ray line intensities measured at different incident energies across the Li absorption edge energies of both elements based on HFS and DHF models.

A wide-bandpass multilayer monochromator and its application to the determination of absolute structure

2004 ◽  
Vol 37 (1) ◽  
pp. 136-142
Author(s):  
T. Koganezawa ◽  
K. Uno ◽  
H. Iwasaki ◽  
N. Nakamura ◽  
Y. Yoshimura ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Absorption Edge ◽  
Wide Band ◽  
Imaging Plate ◽  
Parallel Beam ◽  
X Ray ◽  
Diffraction Patterns ◽  
Absolute Structure ◽  
Imaging Plate Detector

A diffraction system has been constructed at the Synchrotron Radiation Centre at Ritsumeikan University, in which a wide-band parallel X-ray beam is produced by reflection from the depth-graded multilayer monochromator. The band width is 600 eV and the monochromator is useful in the photon energy range from 6500 to 7700 eV. In diffraction patterns of an oscillating single crystal recorded using the beam, Bragg reflections appear in an elongated form on an imaging-plate detector and, if the absorption edge of an atom in the crystal is included in the band, a characteristic intensity profile is seen due to anomalous dispersion. As an application of the system, the absolute configuration was determined for a newly synthesized compound, 4-(1-hydroxyethyl)phenylferrocene, C18H18FeO, with an enantiomorphic structure, choosing the Fe atoms as anomalous scatterers. In the intensity profiles of the Friedel pairs of reflections, clear contrast between the pair was observed at the absorption edge, leading unequivocally to theSform. Further possible application of the wide-bandpass parallel beam is discussed.

Tensorial Representation of ƒ′ for Nb in Lithium-niobate, LiNbO3

1988 ◽  
Vol 43 (4) ◽  
pp. 388-390
Author(s):  
A. Petcov ◽  
A. Kirfel ◽  
K. Fischer
Keyword(s):  
Synchrotron Radiation ◽  
Lithium Niobate ◽  
Raman Scattering ◽  
Absorption Edge ◽  
Incident Radiation ◽  
Momentum Operator ◽  
Optical Theorem ◽  
X Ray ◽  
Resonant Phenomena

AbstractUsing Synchrotron radiation, the dependence of resonant phenomena (absorption, fluorescence and Raman scattering) on the angle between the polarisation plane of the incident radiation and the polar c-axis in ferroelectric Lithium-niobate, LiNbO3, was studied in the vicinity of the Nb K-absorption edge. Applying the "optical theorem", the observed dipolar anisotropics can be explained in terms of the projection of the dipole momentum operator on the polarisation vector of the X-ray photons.

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