Journal of Synchrotron Radiation Journal of
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JOURNAL OF
SYNCHROTRON
RADIATION

Volume 13| Part 3

ISSN: 1600-5775

May 2006 issue

Cover illustration: The prism array X-ray lens clessidra developed at ELETTRA (Sincrotrone Trieste), see Jark, Pérennès and Matteucci, pages 239-252. Top: micrograph of the lens produced using deep X-ray lithography at the DXRL beamline at ELETTRA. The lens is made of pmma (polymethylmethacrylate = plexiglass) and consists of small prisms of height 25.67 µm and width 77.33 µm. The overall structure is 1.51 mm high, 2.6 mm wide and 0.65 mm deep. Bottom: radiographs taken 30 mm downstream of the lens during the tilt alignment with a photon energy of 10 keV (tilt increment 1°). A CCD camera with 3.85 µm equivalent pixel size was used at the SYRMEP beamline at ELETTRA at a source distance of 22.6 m. In this lens the resist thickness varied in the beam direction.

facility information

APS

MAX IV

PSI

SPring‑8

research papers

The ID23-1 structural biology beamline at the ESRF

D. Nurizzo, T. Mairs, M. Guijarro, V. Rey, J. Meyer, P. Fajardo, J. Chavanne, J.-C. Biasci, S. McSweeney and E. Mitchell

A detailed description of the ID23-1 structural biology beamline at the ESRF is given, with a description of the automated hardware and software environments for beamline staff and user community.

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On the feasibility of large-aperture Fresnel lenses for the microfocusing of hard X-rays

W. Jark, F. Pérennès and M. Matteucci

The limitations of the aperture of highly regular Fresnel X-rays lenses due to absorption, chromatic aberrations and the `thin lens' approximation are discussed. Experimental data for the refraction efficiency are interpreted.

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Optimizing the signal-to-noise ratio for X-ray photon correlation spectroscopy

P. Falus, L. B. Lurio and S. G. J. Mochrie

A calculation is presented to maximize the signal-to-noise ratio of an X-ray photon correlation spectroscopy beamline by finding the optimum detector pixel size, optimum collimation and optimum X-ray energy.

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Evaluation of imaging performance of a taper optics CCD `FReLoN' camera designed for medical imaging

P. Coan, A. Peterzol, S. Fiedler, C. Ponchut, J. C. Labiche and A. Bravin

Full characterization in terms of modulation transfer function, normalized noise power spectrum and detective quantum efficiency of a fast-readout low-noise (FReLoN) CCD camera coupled to a fiberoptical taper, a detector developed at the European Synchrotron Radiation Facility.

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X-ray diffractometer combining synchrotron radiation and pulsed magnetic fields up to 40 T

Y. Narumi, K. Kindo, K. Katsumata, M. Kawauchi, C. Broennimann, U. Staub, H. Toyokawa, Y. Tanaka, A. Kikkawa, T. Yamamoto, M. Hagiwara, T. Ishikawa and H. Kitamura

A synchrotron X-ray diffractometer incorporating a pulsed field magnet for high fields up to 40 T has been developed and a detailed description of this instrument is reported.

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Temperature-resolved in situ X-ray absorption spectroscopic study on the reduction of nanostructured Fe₂O₃ within the pore system of mesoporous carbon CMK-1

H. Huwe and M. Fröba

First results on the reduction of iron oxide nanoparticles within a mesoporous carbon CMK-1 host structure are given. The thermochemical behaviour was monitored by temperature-dependent in situ X-ray absorption spectroscopic measurements. In summary, one can say that the kinetics of the reduction steps Fe₂O₃ → Fe₃O₄ → Fe_1−xO → Fe⁰ are mainly affected by the particle size, as well as the spatial and chemical environment.

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short communications

Nearly perfect large-area quartz: 4 meV resolution for 10 keV photons over 10 cm²

J. P. Sutter, A. Q. R. Baron, D. Miwa, Y. Nishino, K. Tamasaku and T. Ishikawa

Bragg backscattering of 10 keV X-rays from large commercial quartz crystals has shown low defect concentrations and experimental energy widths of 4.0 meV. Quartz thus appears to be a useful X-ray optical material, particularly for meV-resolution energy analyzers of X-rays with energy 12 keV or less.

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High-resolution powder diffraction study of purple membrane with a large Guinier-type camera

T. Oka, K. Miura, K. Inoue, T. Ueki and N. Yagi

X-ray diffraction patterns from a film of oriented purple membranes, which comprise two-dimensional crystals of bacteriorhodopsin trimers, were recorded with a 1 m-pathlength Guinier-type camera at SPring-8 BL40B2. Diffraction peaks were observed up to a resolution of 2.3 Å and a projected electron density map was calculated with intensities up to a spacing of 4.2 Å.

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