Double-crystal diffraction imaging with a small effective divergence source: application to the magneto-acoustic vibrations in FeBO3

2000 ◽  
Vol 33 (4) ◽  
pp. 1051-1058
Author(s):  
Ioanna Matsouli ◽  
Vladimir V. Kvardakov ◽  
José Baruchel
Keyword(s):  
Synchrotron Radiation ◽  
Spatial Dispersion ◽  
Angular Size ◽  
Standing Waves ◽  
Bragg Diffraction ◽  
Elastic Coupling ◽  
Acoustic Vibrations ◽  
Double Crystal ◽  
Double Crystal Monochromator ◽  
Diffraction Imaging

Ultrasonic standing waves, excited in FeBO3(111) crystal plates through magneto-elastic coupling, were visualized using monochromatic Bragg diffraction imaging (topography) with synchrotron radiation. The images depend strongly on whether diffraction by the sample occurs in the same plane as in the double-crystal monochromator, or in the perpendicular plane. The observations are explained by taking into account (a) the strong spatial dispersion which prevails because of the small effective divergence (angular size of the source as seen from a point in the specimen), which is less than one microradian in this experiment, and (b) the sample vibration and curvature.

An accurate theory of X-ray coplanar multiple SRMS diffractometry

2018 ◽  
Vol 74 (6) ◽  
pp. 673-680 ◽  
Author(s):  
V. G. Kohn
Keyword(s):  
Synchrotron Radiation ◽  
Plane Wave ◽  
Experimental Setup ◽  
Incident Plane Wave ◽  
Instrumental Function ◽  
Multiple Diffraction ◽  
Double Crystal ◽  
X Ray ◽  
Double Crystal Monochromator ◽  
Incident Plane

The article reports an accurate theory of X-ray coplanar multiple diffraction for an experimental setup that consists of a generic synchrotron radiation (SR) source, double-crystal monochromator (M) and slit (S). It is called for brevity the theory of X-ray coplanar multiple SRMS diffractometry. The theory takes into account the properties of synchrotron radiation as well as the features of diffraction of radiation in the monochromator crystals and the slit. It is shown that the angular and energy dependence (AED) of the sample reflectivity registered by a detector has the form of a convolution of the AED in the case of the monochromatic plane wave with the instrumental function which describes the angular and energy spectrum of radiation incident on the sample crystal. It is shown that such a scheme allows one to measure the rocking curves close to the case of the monochromatic incident plane wave, but only using the high-order reflections by monochromator crystals. The case of four-beam (220)(331)({\overline {11}}1) diffraction in Si is considered in detail.

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.

Nuclear Bragg Diffraction of Synchrotron Radiation in the Presence of Acoustic Vibrations

1993 ◽  
Vol 22 (4) ◽  
pp. 305-310 ◽  
Author(s):  
Yu. V Shvyd'ko ◽  
A. I Chumakov ◽  
G. V Smirnov ◽  
V. G Kohn ◽  
T Hertrich ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Bragg Diffraction ◽  
Acoustic Vibrations

scholarly journals Crystal structure of posnjakite formed in the first crystal water-cooling line of the ANSTO Melbourne Australian Synchrotron MX1 Double Crystal Monochromator

2020 ◽  
Vol 76 (7) ◽  
pp. 1136-1138
Author(s):  
Stuart Mills ◽  
Jun Aishima ◽  
David Aragao ◽  
Tom Tudor Caradoc-Davies ◽  
Nathan Cowieson ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Synchrotron Radiation ◽  
Hydrogen Bonds ◽  
Water Cooling ◽  
Double Crystal ◽  
Crystal Water ◽  
Double Crystal Monochromator ◽  
Jahn Teller ◽  
Additional Hydrogen

Exceptionally large crystals of posnjakite, Cu4SO4(OH)6(H2O), formed during corrosion of a Swagelock(tm) Snubber copper gasket within the MX1 beamline at the ANSTO-Melbourne, Australian Synchrotron. The crystal structure was solved using synchrotron radiation to R 1 = 0.029 and revealed a structure based upon [Cu4(OH)6(H2O)O] sheets, which contain Jahn–Teller-distorted Cu octahedra. The sulfate tetrahedra are bonded to one side of the sheet via corner sharing and linked to successive sheets via extensive hydrogen bonds. The sulfate tetrahedra are split and rotated, which enables additional hydrogen bonds.

Performance of the Daresbury synchrotron radiation source soft x‐ray double‐crystal monochromator

1992 ◽  
Vol 63 (1) ◽  
pp. 1322-1325 ◽  
Author(s):  
M. D. Roper ◽  
P. A. Buksh ◽  
I. W. Kirkman ◽  
G. van der Laan ◽  
H. A. Padmore ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Radiation Source ◽  
Synchrotron Radiation Source ◽  
Double Crystal ◽  
X Ray ◽  
Double Crystal Monochromator

scholarly journals Inception and movement of a `subgrain boundary precursor' in ice under an applied stress, observed by X-ray synchrotron radiation Bragg imaging

2015 ◽  
Vol 48 (3) ◽  
pp. 672-678 ◽  
Author(s):  
A. Philip ◽  
L. Capolo ◽  
J. Meyssonnier ◽  
J. Baruchel
Keyword(s):  
Synchrotron Radiation ◽  
Basal Slip ◽  
Strain State ◽  
Applied Load ◽  
Subgrain Boundary ◽  
Bragg Diffraction ◽  
Ice Crystals ◽  
X Ray ◽  
Integrated Intensity ◽  
Diffraction Imaging

Basal slip of dislocations, the easiest deformation mechanism of ice crystals, does not allow a response to any strain state. The first steps of another mechanism, with a moving subgrain boundary precursor region, which permits accommodating the effect of an applied load, is investigated on an ice single crystal, mainly using synchrotron radiation Bragg diffraction imaging. During this process, the evolution of the local integrated intensity shows that there is both a general multiplication of dislocations within the crystal and a movement of basal dislocations towards the surface. The `subgrain boundary precursor' region evolves towards a classical grain boundary when further deformed.

Section and stroboscopic diffraction imaging of the magneto-acoustic vibrations in FeBO3by synchrotron radiation

1999 ◽  
Vol 32 (10A) ◽  
pp. A104-A108 ◽  
Author(s):  
Ioanna Matsouli ◽  
Etienne Pernot ◽  
José Baruchel ◽  
Vladimir Kvardakov ◽  
Laurent Chabert ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Acoustic Vibrations ◽  
Diffraction Imaging

Micro X-Ray Fluorescence Analysis with Synchrotron Radiation

1988 ◽  
Vol 32 ◽  
pp. 141-147
Author(s):  
Shinjiro Hayakawa ◽  
Atsuo Iida ◽  
Sadao Aoki ◽  
Yohichi Gohshi
Keyword(s):  
Synchrotron Radiation ◽  
Fluorescence Analysis ◽  
X Rays ◽  
Beam Spot ◽  
Double Crystal ◽  
X Ray ◽  
Double Crystal Monochromator ◽  
Surface Irregularities ◽  
Sufficient Intensity ◽  
Beam Excitation

AbstractA synchrotron radiation X-ray micro analyzer(SRXMA) was developed at Photon Factory in Japan. The present SRXMA combines a double crystal monochromator and mirror optics and either a white or a monochromatic microbeam can be used. Micro X-ray fluorescence analysis was carried out, and a minimum detection limit of 1 ppm for Mn was obtained for 100 sec measurement with the white beam. With monochromatic beam excitation, micro X-ray spectroscopies are now feasible.The obtained beam size was 1.6 μ;m - 34 μm* The beam was blurred in one direction by the scattered X-rays caused by the surface irregularities of the focusing mirror. Improvements in the mirror quality will ensure a beam spot of just a few microns with sufficient intensity.

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