The multicrystal monochromators of the TROIKA beamline at ESRF

A multicrystal UHV monochromator equipped with up to four different monochromator crystals, which can be exchanged in situ, is described. The monochromator is designed as a transmission monochromator in horizontal scattering geometry allowing the `quasi-white' beam, after transmission through X-ray-transparent diamond or beryllium monochromator crystals, to be utilized in independent downstream stations.

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Structural Defect Studies of Semiconductor Crystals with Laue Topography

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.178-179.360 ◽

2011 ◽

Vol 178-179 ◽

pp. 360-365 ◽

Cited By ~ 2

Author(s):

Alexander Gröschel ◽

Johannes Will ◽

Christoph Bergmann ◽

Hannes Grillenberger ◽

Stefan Eichler ◽

...

Keyword(s):

High Energy ◽

Structural Defects ◽

Dislocation Network ◽

X Ray ◽

Gaas Wafer ◽

Semiconductor Crystals ◽

White Beam ◽

Oxygen Precipitates ◽

Si Wafer

A defocused Laue diffractometer setup operating with the white beam of a high energy X-ray tube has been used for a topographic visualization of structural defects in semiconductor wafers. The laboratory white beam X-ray topograph of a Czochralski Si wafer with oxygen precipitates grown in an annealing process is compared to a μPCD image. Further, the dislocation network in a VGF GaAs wafer is studied under thermal annealing up to 1140°C and the in-situ capability of the setup is demonstrated.

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PHASE FORMATION AND TEXTURE DEVELOPMENT IN AG-SHEATHED Bi, Pb(2223) TAPES STUDIED BY DIFFERENT IN-SITU AND EX-SITU DIFFRACTION TECHNIQUES

International Journal of Modern Physics B ◽

10.1142/s0217979200002788 ◽

2000 ◽

Vol 14 (25n27) ◽

pp. 2688-2693 ◽

Cited By ~ 4

Author(s):

E. GIANNINI ◽

E. BELLINGERI ◽

F. MARTI ◽

M. DHALLÉ ◽

V. HONKIMÄKI ◽

...

Keyword(s):

High Energy ◽

Texture Development ◽

Ex Situ ◽

X Ray Diffraction ◽

X Ray ◽

Scattering Geometry ◽

Reflection Geometry ◽

Comparison Of The Results ◽

In Situ Neutron Diffraction

In-situ and ex-situ high energy (80÷88 keV) X-Ray diffraction from a synchrotron radiation source were performed on multifilamentary Bi, Pb(2223)/Ag tapes using a transmission scattering geometry. Several thermo-mechanical procedures were compared, focusing mainly on the texture development of both Bi, Pb(2212) and Bi, Pb(2223) phases. The effect of the periodic pressing on the texture and on the critical current is elucidated. The texture development of the Bi, Pb(2212) phase prior to its transformation into Bi, Pb(2223) was directly observed in-situ at high temperature by using a dedicated high-energy X-ray compatible furnace and a high resolution Image Plate detector. A sharp increase of the Bi, Pb(2212) grain orientation along the [00l] direction was found to occur only above 750°C. Normal state transport measurements are in full agreement with the formation mechanism and with the texture development observed. A comparison of the results with the ones provided by in-situ neutron diffraction and standard low-energy XRD in a reflection geometry is presented.

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High-pressure developments for resonant X-ray scattering experiments at I16

Journal of Synchrotron Radiation ◽

10.1107/s1600577519016308 ◽

2020 ◽

Vol 27 (2) ◽

pp. 351-359

Author(s):

I. Povedano ◽

A. Bombardi ◽

D. G. Porter ◽

M. Burt ◽

S. Green ◽

...

Keyword(s):

High Pressure ◽

Low Temperature ◽

The Body ◽

X Ray ◽

X Ray Scattering ◽

Scattering Geometry ◽

Diamond Anvil ◽

Membrane Cell ◽

Ray Scattering

An experimental setup to perform high-pressure resonant X-ray scattering (RXS) experiments at low temperature on I16 at Diamond Light Source is presented. The setup consists of a membrane-driven diamond anvil cell, a panoramic dome and an optical system that allows pressure to be measured in situ using the ruby fluorescence method. The membrane cell, inspired by the Merrill–Bassett design, presents an asymmetric layout in order to operate in a back-scattering geometry, with a panoramic aperture of 100° in the top and a bottom half dedicated to the regulation and measurement of pressure. It is specially designed to be mounted on the cold finger of a 4 K closed-cycle cryostat and actuated at low-temperature by pumping helium into the gas membrane. The main parts of the body are machined from a CuBe alloy (BERYLCO 25) and, when assembled, it presents an approximate height of 20–21 mm and fits into a 57 mm diameter. This system allows different materials to be probed using RXS in a range of temperatures between 30 and 300 K and has been tested up to 20 GPa using anvils with a culet diameter of 500 µm under quasi-cryogenic conditions. Detailed descriptions of different parts of the setup, operation and the developed methodology are provided here, along with some preliminary experimental results.

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White-beam X-ray radioscopy and tomography with simultaneous diffraction at the EDDI beamline

Journal of Synchrotron Radiation ◽

10.1107/s0909049513018670 ◽

2013 ◽

Vol 20 (5) ◽

pp. 809-810 ◽

Cited By ~ 11

Author(s):

F. García-Moreno ◽

C. Jiménez ◽

P. H. Kamm ◽

M. Klaus ◽

G. Wagener ◽

...

Keyword(s):

Pixel Size ◽

X Ray ◽

Simultaneous Imaging ◽

White Beam ◽

Set Up

A set-up for simultaneous imaging and diffraction that yields radiograms with up to 200 frames per second and 5.6 µm effective pixel size is presented. Tomograms and diffractograms are acquired together in 10 s. Two examples illustrate the attractiveness of combining these methods at the EDDI beamline forin situstudies.

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Photolysis of Fluorinated Graphites with Embedded Acetonitrile Using a White-Beam Synchrotron Radiation

Nanomaterials ◽

10.3390/nano12020231 ◽

2022 ◽

Vol 12 (2) ◽

pp. 231

Author(s):

Galina I. Semushkina ◽

Yuliya V. Fedoseeva ◽

Anna A. Makarova ◽

Dmitry A. Smirnov ◽

Igor P. Asanov ◽

...

Keyword(s):

Synchrotron Radiation ◽

Photoelectron Spectroscopy ◽

X Ray ◽

Photon Irradiation ◽

Nexafs Spectroscopy ◽

White Beam ◽

Nitrogen Doped Graphene ◽

Doped Graphene ◽

X Ray Absorption

Fluorinated graphitic layers with good mechanical and chemical stability, polar C–F bonds, and tunable bandgap are attractive for a variety of applications. In this work, we investigated the photolysis of fluorinated graphites with interlayer embedded acetonitrile, which is the simplest representative of the acetonitrile-containing photosensitizing family. The samples were continuously illuminated in situ with high-brightness non-monochromatized synchrotron radiation. Changes in the compositions of the samples were monitored using X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The NEXAFS N K-edge spectra showed that acetonitrile dissociates to form HCN and N2 molecules after exposure to the white beam for 2 s, and the latter molecules completely disappear after exposure for 200 s. The original composition of fluorinated matrices CF0.3 and CF0.5 is changed to CF0.10 and GF0.17, respectively. The highly fluorinated layers lose fluorine atoms together with carbon neighbors, creating atomic vacancies. The edges of vacancies are terminated with the nitrogen atoms and form pyridinic and pyrrolic units. Our in situ studies show that the photolysis products of acetonitrile depend on the photon irradiation duration and composition of the initial CFx matrix. The obtained results evaluate the radiation damage of the acetonitrile-intercalated fluorinated graphites and the opportunities to synthesize nitrogen-doped graphene materials.

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