Quantitative alignment parameter estimation for analyzing X-ray photoelectron spectra
The interpretation of X-ray photoelectron spectroscopy (XPS) data relies on measurement models that depend on several parameters, including the photoelectron attenuation length and X-ray photon flux. However, some of these parameters are not known, because they are not or cannot be measured. The unknown geometrical parameters can be lumped together in a multiplicative factor, the alignment parameter. This parameter characterizes the ability of the exciting light to interact with the sample. Unfortunately, the absolute value of the alignment parameter cannot be measured directly, in part because it depends on the measuremen...
Source: Journal of Synchrotron Radiation - June 16, 2023 Category: Physics Authors: Ozon, M. Tumashevich, K. Prisle, N.L. Tags: X-ray photoelectron spectroscopy experimental alignment parameter measurement model liquid jet quantitative data inversion research papers Source Type: research
High-pressure single-crystal diffraction at the Australian Synchrotron
A new high-pressure single-crystal diffraction setup has been designed and implemented at the Australian Synchrotron for collecting molecular and protein crystal structures. The setup incorporates a modified micro-Merrill – Bassett cell and holder designed specifically to fit onto the horizontal air-bearing goniometer, allowing high-pressure diffraction measurements to be collected with little to no modification of the beamline setup compared with ambient data collections. Compression data for the amino acid, l-threonine, and the protein, hen egg-white lysozyme, were collected, showcasing the capabilities of the setup. (...
Source: Journal of Synchrotron Radiation - June 15, 2023 Category: Physics Authors: Boer, S.A. Price, J.R. Riboldi-Tunnicliffe, A. Williamson, R. Summers, A. Turner, G.F. Jones, I. Bond, C. Vrielink, A. Marshall, A.C. Hitchings, J. Moggach, S.A. Tags: pressure synchrotron single crystal beamlines Source Type: research
A MHz X-ray diffraction set-up for dynamic compression experiments in the diamond anvil cell
An experimental platform for dynamic diamond anvil cell (dDAC) research has been developed at the High Energy Density (HED) Instrument at the European X-ray Free Electron Laser (European XFEL). Advantage was taken of the high repetition rate of the European XFEL (up to 4.5 MHz) to collect pulse-resolved MHz X-ray diffraction data from samples as they are dynamically compressed at intermediate strain rates ( ≤ 103 s − 1), where up to 352 diffraction images can be collected from a single pulse train. The set-up employs piezo-driven dDACs capable of compressing samples in ≥ 340 µ s, compatible with the maxi...
Source: Journal of Synchrotron Radiation - June 15, 2023 Category: Physics Authors: Husband, R.J. Strohm, C. Appel, K. Ball, O.B. Briggs, R. Buchen, J. Cerantola, V. Chariton, S. Coleman, A.L. Cynn, H. Dattelbaum, D. Dwivedi, A. Eggert, J.H. Ehm, L. Evans, W.J. Glazyrin, K. Goncharov, A.F. Graafsma, H. Howard, A. Huston, L. Hutchinson, T Tags: extreme conditions science X-ray free-electron lasers diamond anvil cells dynamic compression research papers Source Type: research
Towards a wavefront-preservation X-ray crystal monochromator for high-repetition-rate FELs
The wavefront preservation of coherent X-ray free-electron laser beams is pushing the requirement on the quality and performance of X-ray optics to an unprecedented level. The Strehl ratio can be used to quantify this requirement. In this paper, the criteria for thermal deformation of the X-ray optics are formulated, especially for crystal monochromators. To preserve the X-ray wavefront, the standard deviation of the height error should be sub-nm for mirrors and less than 25 pm for crystal monochromators. Cryocooled silicon crystals combined with two techniques can be used to achieve this level of performance for monoc...
Source: Journal of Synchrotron Radiation - June 15, 2023 Category: Physics Authors: Zhang, L. Seaberg, M. Yava ş , H. Tags: X-ray optics monochromator crystal thermal deformation wavefront preservation Strehl ratio FEL research papers Source Type: research
Mapping nanocrystal orientations via scanning Laue diffraction microscopy for multi-peak Bragg coherent diffraction imaging
The recent commissioning of a movable monochromator at the 34-ID-C endstation of the Advanced Photon Source has vastly simplified the collection of Bragg coherent diffraction imaging (BCDI) data from multiple Bragg peaks of sub-micrometre scale samples. Laue patterns arising from the scattering of a polychromatic beam by arbitrarily oriented nanocrystals permit their crystal orientations to be computed, which are then used for locating and collecting several non-co-linear Bragg reflections. The volumetric six-component strain tensor is then constructed by combining the projected displacement fields that are imaged using ea...
Source: Journal of Synchrotron Radiation - May 30, 2023 Category: Physics Authors: Zhang, Y. Porter, J.N. Wilkin, M.J. Harder, R. Cha, W. Suter, R.M. Liu, H. Schnebly, L. Sandberg, R.L. Miller, J.A. Tischler, J. Pateras, A. Rollett, A.D. Tags: Laue diffraction BCDI synchrotron Bragg diffraction research papers Source Type: research
A compact gas attenuator for the SwissFEL ATHOS beamline realized using additive manufacturing
Gas attenuators are important devices providing accurate variation of photon intensity for soft X-ray beamlines. In the SwissFEL ATHOS beamline front-end the space is very limited and an innovative approach has been taken to provide attenuation of three orders of magnitude up to an energy of 1200 eV. Additive manufacturing of a differential pumping system vacuum manifold allowed a triple pumping stage to be realized in a space of less than half a meter. Measurements have shown that the response of the device is as expected from theoretical calculations. (Source: Journal of Synchrotron Radiation)
Source: Journal of Synchrotron Radiation - May 30, 2023 Category: Physics Authors: Pradervand, C. Rosenberg, C. Eckerlin, H.-J. Schnorr, K. Al Haddad, A. Wiegand, P. Hess, C. Gaiffi, N. Patthey, L. Tags: X-ray free-electron lasers gas attenuator additive manufacturing research papers Source Type: research
X-ray mirrors with sub-nanometre figure errors obtained by differential deposition of thin WSi2 films
Differential deposition by DC magnetron sputtering was applied to correct for figure errors of X-ray mirrors to be deployed on low-emittance synchrotron beamlines. During the deposition process, the mirrors were moved in front of a beam-defining aperture and the required velocity profile was calculated using a deconvolution algorithm. The surface figure was characterized using conventional off-line visible-light metrology instrumentation (long trace profiler and Fizeau interferometer) before and after the deposition. WSi2 was revealed to be a promising candidate material since it conserves the initial substrate surface rou...
Source: Journal of Synchrotron Radiation - May 30, 2023 Category: Physics Authors: Bras, P. Morawe, C. Labour é , S. Perrin, F. Vivo, A. Barrett, R. Tags: X-ray optics figure correction differential deposition surface roughness film stress off-line metrology Fizeau stitching long trace profiler magnetron sputtering research papers Source Type: research
In situ X-ray area detector flat-field correction at an operating photon energy without flat illumination. Corrigendum
The name of an author in the article by Weng et al. (2023) [J. Synchrotron Rad. 30, 546 – 554] is corrected. (Source: Journal of Synchrotron Radiation)
Source: Journal of Synchrotron Radiation - May 26, 2023 Category: Physics Authors: Weng, J. Xu, W. Wiaderek, K.M. Borkiewicz, O.J. Chen, J. Von Dreele, R.B. Gallington, L.C. Ruett, U. Tags: flat-field correction flat-field calibration dectector drift addenda and errata Source Type: research
Micropipette aspiration as a tool for single-particle X-ray imaging and diffraction
A sample environment and manipulation tool is presented for single-particle X-ray experiments in an aqueous environment. The system is based on a single water droplet, positioned on a substrate that is structured by a hydrophobic and hydrophilic pattern to stabilize the droplet position. The substrate can support several droplets at a time. Evaporation is prevented by covering the droplet by a thin film of mineral oil. In this windowless fluid which minimizes background signal, single particles can be probed and manipulated by micropipettes, which can easily be inserted and steered in the droplet. Holographic X-ray imaging...
Source: Journal of Synchrotron Radiation - May 26, 2023 Category: Physics Authors: Bruns, H. Hoeppe, H. Bellec, E. Leake, S. Osterhoff, M. Salditt, T. Tags: micropipette aspiration holographic X-ray imaging single-particle diffraction sample delivery of biophysical samples research papers Source Type: research
Phase segregation and miscibility of TiOx nanocomposites in Gd-doped ceria solid electrolyte material
Electro-chemo-mechanical (ECM) coupling refers to mechanical deformation due to electrochemically driven compositional change in a solid. An ECM actuator producing micrometre-size displacements and long-term stability at room temperature was recently reported, comprising a 20 mol% Gd-doped ceria (20GDC), a solid electrolyte membrane, placed between two working bodies made of TiOx/20GDC (Ti-GDC) nanocomposites with Ti concentration of 38 mol%. The volumetric changes originating from oxidation or reduction in the local TiOx units are hypothesized to be the origin of mechanical deformation in the ECM actuator. Studyin...
Source: Journal of Synchrotron Radiation - May 26, 2023 Category: Physics Authors: Li, J. Routh, P.K. Li, Y. Plonka, A. Makagon, E. Lubomirsky, I. Frenkel, A. Tags: X-ray absorption spectroscopy electro-chemo-mechanical effect local structural disorder research papers Source Type: research
Analysis of the dislocation activity of Mg – Zn – Y alloy using synchrotron radiation under tensile loading
An understanding of deformation behavior and texture development is crucial for the formability improvement of Mg alloys. X-ray line profile analysis using the convolutional multiple whole profile (CMWP) fitting method allows the experimental determination of dislocation densities separately for different Burgers vectors up to a high deformation degree. A wider use of this technique still requires exploration and testing of various materials. In this regard, the reliability of the CMWP fitting method for Mg – Zn – Y alloys, in terms of the dislocation activity during tensile deformation, was verified in the present stu...
Source: Journal of Synchrotron Radiation - May 11, 2023 Category: Physics Authors: Ha, C. Kim, Y.M. Woo, S.K. Maawad, E. Letzig, D. Yi, S. Tags: dislocation slip activity synchrotron radiation tensile test magnesium alloy research papers Source Type: research
Development of a custom-made 2.8 T permanent-magnet dipole photon source for the ROCK beamline at SOLEIL
In August 2021, the SOLEIL storage ring was restarted after the summer shutdown with a new bending magnet made entirely of permanent magnets. Producing a magnetic field of 2.8 T, it replaced one of the 32 electromagnetic dipoles (magnetic field of 1.7 T) of the ring to allow the ROCK beamline to exploit more intense photon fluxes in the hard X-ray range, thus improving the time resolution performances of the beamline for experiments carried out above 20 keV. The reduction of the new dipole magnetic gap required to produce the higher field has led to the construction and installation of a new vacuum vessel. The ...
Source: Journal of Synchrotron Radiation - May 10, 2023 Category: Physics Authors: Brunelle, P. B é chu, N. Briois, V. Marteau, F. Ribbens, M. Berteaud, P. Del é toille, X. Dupuy, E. Herbeaux, C. Labat, M. Lestrade, A. Nadji, A. Nadolski, L. Nouna, M. Pruvost, J.-B. Tags: SOLEIL synchrotron light source permanent magnet dipole ROCK photon beamline research papers Source Type: research
Harmonic radiation contribution and X-ray transmission at the Small Quantum Systems instrument of European XFEL
Transmission measurements of the soft X-ray beamline to the Small Quantum Systems (SQS) scientific instrument at the SASE3 undulator of European XFEL are presented. Measurements are reported for a wide range of photon energies (650 eV to 2400 eV), using X-ray gas monitors as well as a bolometric radiometer. The results are in good agreement with simulations for the beam transport and show a transmission of up to 80% over the whole photon energy range. The contribution of second- and third-harmonic radiation of the soft X-ray undulator is determined at selected photon energies by performing transmission measurements...
Source: Journal of Synchrotron Radiation - May 10, 2023 Category: Physics Authors: Baumann, T.M. Boll, R. De Fanis, A. Grychtol, P. Ilchen, M. Jastrow, U.F. Kato, M. Lechner, C. Maltezopoulos, T. Mazza, T. Monta ñ o, J. Music, V. Ovcharenko, Y. Rennhack, N. Rivas, D.E. Saito, N. Schmidt, P. Serkez, S. Sorokin, A. Usenko, S. Yan, J. Gel Tags: free-electron lasers X-ray beam transport harmonic radiation atomic, molecular and optical science research papers Source Type: research
FlexPES: a versatile soft X-ray beamline at MAX IV Laboratory
FlexPES is a soft X-ray beamline on the 1.5 GeV storage ring at MAX IV Laboratory, Sweden, providing horizontally polarized radiation in the 40 – 1500 eV photon energy range and specializing in high-resolution photoelectron spectroscopy, fast X-ray absorption spectroscopy and electron – ion/ion – ion coincidence techniques. The beamline is split into two branches currently serving three endstations, with a possibility of adding a fourth station at a free port. The refocusing optics provides two focal points on each branch, and enables either focused or defocused beam on the sample. The endstation EA01 at ...
Source: Journal of Synchrotron Radiation - May 9, 2023 Category: Physics Authors: Preobrajenski, A. Generalov, A. Ö hrwall, G. Tchaplyguine, M. Tarawneh, H. Appelfeller, S. Frampton, E. Walsh, N. Tags: photoelectron spectroscopy NEXAFS multi-coincidence soft X-rays beamlines Source Type: research
A von H á mos spectrometer for diamond anvil cell experiments at the High Energy Density Instrument of the European X-ray Free-Electron Laser
A von H á mos spectrometer has been implemented in the vacuum interaction chamber 1 of the High Energy Density instrument at the European X-ray Free-Electron Laser facility. This setup is dedicated, but not necessarily limited, to X-ray spectroscopy measurements of samples exposed to static compression using a diamond anvil cell. Si and Ge analyser crystals with different orientations are available for this setup, covering the hard X-ray energy regime with a sub-eV energy resolution. The setup was commissioned by measuring various emission spectra of free-standing metal foils and oxide samples in the energy range between ...
Source: Journal of Synchrotron Radiation - May 9, 2023 Category: Physics Authors: Kaa, J.M. Kon ô pkov á , Z. Preston, T.R. Cerantola, V. Sahle, C.J. F ö rster, M. Albers, C. Libon, L. Sakrowski, R. Wollenweber, L. Buakor, K. Dwivedi, A. Mishchenko, M. Nakatsutsumi, M. Pl ü ckthun, C. Schwinkendorf, J.-P. Spiekermann, G. Thiering, Tags: X-ray spectroscopy X-ray diffraction inelastic X-ray scattering diamond anvil cell spectrometers imaging spectroscopy X-ray detectors beamlines Source Type: research
