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Preview: Forthcoming in Journal of Synchrotron Radiation

Forthcoming article in Journal of Synchrotron Radiation



Synchrotron radiation research is rapidly expanding with many new sources of radiation being created globally. Synchrotron radiation plays a leading role in pure science and in emerging technologies. The Journal of Synchrotron Radiation provides comprehen



 



High-pressure Seebeck coefficients and thermoelectric behaviors of Bi and PbTe measured using a Paris-Edinburgh cell
A new sample cell assembly for the Paris-Edinburgh type large-volume press to measure Seebeck coefficients and the relative changes in the thermal conductivity and dimensionless figure of merit has been developed and its feasibility demonstrated. The measurements are performed on Bi and PbTe over a temperature range 300–450 K and pressures up to 5.5 GPa.



Effect of atomic vibrations in XANES: polarization-dependent damping of the fine structure at the Cu K-edge of (creat)2CuCl4
A technically simple method to include vibrations in X-ray absorption near-edge structure (XANES) calculations is used to demontrate that vibrations have a significant effect on the polarized Cu K-edge spectrum of creatinium tetrachlorocuprate, (creat)2CuCl4, even in the XANES region.



Current status of the TwinMic beamline at Elettra: a soft X-ray transmission and emission microscopy station
A detailed description of the TwinMic beamline installed at Elettra, Italy, is presented. The beamline hosts a unique soft X-ray microscope supporting both transmission and scanning X-ray microscopy (TXM and STXM, respectively) within the one instrument. The beamline presently fosters the following techniques: STXM, TXM and ptychography, that can be combined with low-energy X-ray fluorescence and X-ray absorption near-edge structure spectroscopies. A detailed update of the design, operational modes and future upgrades of the TwinMic beamline is presented.



Effect of gamma irradiation on X-ray absorption and photoelectron spectroscopy of Nd-doped phosphate glass
Gamma irradiation was found to change the elemental concentration of the atoms in Nd-doped phosphate glass [ok?]. The intensity of the white line in the XANES spectrum correlated with the ratio O/Nd in the glass matrix. The ratio of non-bridging oxygen to total oxygen in the glass after gamma radiation correlated with the concentration of defects in the glass samples. Glasses having a higher concentration of oxygen were found to be soft to gamma irradiation.



High-temperature tensile cell for in situ real-time investigation of carbon fibre carbonization and graphitization processes
A unique high-temperature cell combined with in situ wide-angle X-ray diffraction was used to follow the formation of graphitic structure in carbon fibre produced from a polyacrylo­nitrile precursor.



Nanox: a miniature mechanical stress rig designed for near-field X-ray diffraction imaging techniques
A compact design for a miniature tensile stress rig, compatible with the space and weight constraints imposed by near-field diffraction imaging techniques, is presented. The device can carry tensile loads up to 500 N and is driven by a piezoelectric actuator which can work in a static and dynamic regime up to frequencies of 100 Hz.






Augmentation of the step-by-step Energy-Scanning EXAFS beamline BL-09 to continuous-scan EXAFS mode at INDUS-2 SRS
An innovative scheme to carry out continuous X-ray absorption spectroscopy measurements similar to quick-EXAFS mode at the step-by-step Energy-Scanning EXAFS beamline BL-09 at the INDUS-2 synchrotron source is presented.



Design and performance of BOREAS, the beamline for resonant X-ray absorption and scattering experiments at the ALBA synchrotron light source
BOREAS is a beamline operating at the ALBA Synchrotron Light Source, dedicated to resonant X-ray absorption and scattering experiments using soft X-rays, in an unusually extended photon energy range from 80 to >4000 eV, with full polarization control. Here its optical scheme and the first commissioning results are described.






Using irregularly spaced current peaks to generate an isolated attosecond X-ray pulse in free-electron lasers
A method is proposed to generate an isolated attosecond X-ray free-electron laser pulse with the peak power beyond 1 TW.



Creating flat-top X-ray beams by applying surface profiles of alternating curvature to deformable piezo bimorph mirrors
A piezo bimorph mirror is deformed into three distinct re-entrant surface modifications as well as being simply defocused. A re-entrant modification with seven segments (the maximum possible for this mirror) produces an expanded beam with less striation than a simply defocused beam.



Fabrication and testing of a newly designed slit system for depth-resolved X-ray diffraction measurements
A newly designed system of slits for depth-resolved X-ray powder diffraction has been developed and tested at the National Synchrotron Light Source.



Determination of the packing fraction in photonic glass using synchrotron radiation nanotomography
Synchrotron radiation nanotomography has been used to quantify the packing fraction in a photonic glass sample.



Nuclear incorporation of iron during the eukaryotic cell cycle
Scanning X-ray fluorescence microscopy has been used to probe the distribution of S, P and Fe within cell nuclei at the new ID16 beamline. Estimates of P, S and mass signals for the chromosomal matter agree with quantitative X-ray phase contrast projection microscopy images of the same samples, while fluorescence shows Fe incorporation.



X-ray powder diffraction at the XRD1 beamline at LNLS
X-ray powder diffraction at the upgraded and comissioned XRD1 beamline is reported. The beamline operates in the 5.5–14 keV range with a photon flux of 3.4 × 1010 photons s−1 at 8 keV.






Brownian and advective dynamics in microflow studied by coherent X-ray scattering experiments
Combining microfluidics with coherent X-ray experiments enables the flow characterization of collodial suspensions in microflow of different geometries. Here, evaluation of the flow geometries, main flow directions, advective flow velocities and diffusive dynamics are presented.



A multi-MHz single-shot data acquisition scheme with high dynamic range: pump–probe X-ray experiments at synchrotrons
A time-resolved X-ray absorption spectroscopy setup has been developed and tested, comprising a synchronized MHz fiber amplifier laser system with a multi-MHz data acquisition scheme capable of detecting multi-photon events in a single X-ray photon pulse. This system permits recording time-resolved X-ray absorption spectra with quasi-static signal quality.



Measuring the criticality of the `magic condition' for a beam-expanding monochromator
The effect of minor mismatch between the geometric and single-ray foci for a cylindrically bent Laue double-crystal monochromator is examined and found to be less detrimental than previously believed. Even without exact matching, the transverse coherence of the X-ray beam is not deteriorated by the system, enabling the phase-based imaging techniques critical to modern biomedical imaging experiments.