Multicolor single-analyzer high-energy-resolution XES spectrometer for simultaneous examination of different elements
The present work demonstrates the performance of a von H á mos high-energy-resolution X-ray spectrometer based on a non-conventional conical Si single-crystal analyzer. The analyzer is tested with different primary and secondary X-ray sources as well as a hard X-ray sensitive CCD camera. The spectrometer setup is also characterized with ray-tracing simulations. Both experimental and simulated results affirm that the conical spectrometer can efficiently detect and resolve the two pairs of two elements (Ni and Cu) K α X-ray emission spectroscopy (XES) peaks simultaneously, requiring a less than 2 cm-wide array on a sin...
Source: Journal of Synchrotron Radiation - August 12, 2022 Category: Physics Authors: Mikeh á zi, A. El Guettioui, J. F ö ldes, I.B. Vank ó , G. N é meth, Z. Tags: high-energy-resolution X-ray spectroscopies von H á mos geometry laser plasma ray tracing X-ray emission spectroscopy research papers Source Type: research
Application study of infrared free-electron lasers towards the development of amyloidosis therapy
Amyloidosis is known to be caused by the deposition of amyloid fibrils into various biological tissues; effective treatments for the disease are little established today. An infrared free-electron laser (IR-FEL) is an accelerator-based picosecond-pulse laser having tunable infrared wavelengths. In the current study, the irradiation effect of an IR-FEL was tested on an 11-residue peptide (NFLNCYVSGFH) fibril from β 2-microglobulin ( β 2M) with the aim of applying IR-FELs to amyloidosis therapy. Infrared microspectroscopy (IRM) and scanning electron microscopy showed that a fibril of β 2M peptide was clearly dissociated b...
Source: Journal of Synchrotron Radiation - August 12, 2022 Category: Physics Authors: Jindo, M. Nakamura, K. Okumura, H. Tsukiyama, K. Kawasaki, T. Tags: infrared free-electron laser amyloidosis amyloid fibril β 2-microglobulin research papers Source Type: research
Beamline simulations using monochromators with high d-spacing crystals
Monochromators for synchrotron radiation beamlines typically use perfect crystals for the hard X-ray regime and gratings for soft X-rays. There is an intermediate range, typically 1 – 3 keV (tender X-rays), which common perfect crystals have difficulties covering and gratings have low efficiency, although some less common crystals with high d-spacing could be suitable. To evaluate the suitability of these crystals for a particular beamline, it is useful to evaluate the crystals' performance using tools such as ray-tracing. However, simulations for double-crystal monochromators are only available for the most used cry...
Source: Journal of Synchrotron Radiation - August 12, 2022 Category: Physics Authors: Yu, X.J. Chi, X. Smulders, T. Wee, A.T.S. Rusydi, A. Sanchez del Rio, M. Breese, M.B.H. Tags: high d-spacing crystal YB66 crystal monochromators ray tracing SHADOW OASYS research papers Source Type: research
High-resolution XEOL spectroscopy setup at the X-ray absorption spectroscopy beamline P65 of PETRA III
A newly designed setup to perform steady-state X-ray excited optical luminescence (XEOL) spectroscopy and simultaneous XEOL and X-ray absorption spectroscopy characterization at beamline P65 of PETRA III is described. The XEOL setup is equipped with a He-flow cryostat and state-of-the-art optical detection system, which covers a wide wavelength range of 300 – 1700 nm with a high spectral resolution of 0.4 nm. To demonstrate the setup functioning, low-temperature XEOL studies on polycrystalline CuInSe2 thin film, single-crystalline GaN thin film and single-crystalline ZnO bulk semiconductor samples are performed. ...
Source: Journal of Synchrotron Radiation - August 11, 2022 Category: Physics Authors: Levcenko, S. Biller, R. Pfeiffelmann, T. Ritter, K. Falk, H.H. Wang, T. Siebentritt, S. Welter, E. Schnohr, C.S. Tags: XEOL XAS CuInSe2 ZnO GaN research papers Source Type: research
Improved precision in As speciation analysis with HERFD-XANES at the As K-edge: the case of As speciation in mine waste
In this study, linear combination fitting (LCF) was performed on synthetic spectra generated from mixtures of eight measured reference compounds for both HERFD-XANES and transmission-detected XANES to evaluate the improvement in quantitative speciation with HERFD-XANES spectra. The reference compounds arsenolite (As2O3), orpiment (As2S3), getchellite (AsSbS3), arsenopyrite (FeAsS), ka ň kite (FeAsO4 · 3.5H2O), scorodite (FeAsO4 · 2H2O), sodium arsenate (Na3AsO4), and realgar (As4S4) were selected for their importance in mine waste systems. Statistical methods of principal component analysis and target transformation wer...
Source: Journal of Synchrotron Radiation - August 11, 2022 Category: Physics Authors: Saurette, E.M. Frinfrock, Y.Z. Verbuyst, B. Blowes, D.W. McBeth, J.M. Ptacek, C.J. Tags: HERFD-XANES geochemistry mine waste arsenic linear combination fitting research papers Source Type: research
Foreword to the special virtual issue on Actinide physics and chemistry with synchrotron radiation
(Source: Journal of Synchrotron Radiation)
Source: Journal of Synchrotron Radiation - August 10, 2022 Category: Physics Authors: Kvashnina, K.O. Butorin, S.M. Wang, S. Shi, W. Tags: actinides synchrotron radiation editorial Source Type: research
A new Kirkpatrick – Baez-based scanning microscope for the Submicron Resolution X-ray Spectroscopy (SRX) beamline at NSLS-II
The development, construction, and first commissioning results of a new scanning microscope installed at the 5-ID Submicron Resolution X-ray Spectroscopy (SRX) beamline at NSLS-II are reported. The developed system utilizes Kirkpatrick – Baez mirrors for X-ray focusing. The instrument is designed to enable spectromicroscopy measurements in 2D and 3D with sub-200 nm spatial resolution. The present paper focuses on the design aspects, optical considerations, and specifics of the sample scanning stage, summarizing some of the initial commissioning results. (Source: Journal of Synchrotron Radiation)
Source: Journal of Synchrotron Radiation - July 29, 2022 Category: Physics Authors: Nazaretski, E. Coburn, D.S. Xu, W. Ma, J. Xu, H. Smith, R. Huang, X. Yang, Y. Huang, L. Idir, M. Kiss, A. Chu, Y.S. Tags: X-ray microscopy KB optics X-ray microscopy instrumentation beamlines Source Type: research
3D deep convolutional neural network segmentation model for precipitate and porosity identification in synchrotron X-ray tomograms
New developments at synchrotron beamlines and the ongoing upgrades of synchrotron facilities allow the possibility to study complex structures with a much better spatial and temporal resolution than ever before. However, the downside is that the data collected are also significantly larger (more than several terabytes) than ever before, and post-processing and analyzing these data is very challenging to perform manually. This issue can be solved by employing automated methods such as machine learning, which show significantly improved performance in data processing and image segmentation than manual methods. In this work, ...
Source: Journal of Synchrotron Radiation - July 29, 2022 Category: Physics Authors: Gaudez, S. Ben Haj Slama, M. Kaestner, A. Upadhyay, M.V. Tags: 3D U-net deep convolutional neural network TXM nanotomography additive manufacturing research papers Source Type: research
Highly efficient thermal deformation optimization method for smart-cut mirrors over the entire photon energy range
A method to optimize the notches of water-cooled white-beam mirrors over the entire photon energy range is proposed. A theoretical method is used to quantitatively evaluate the influence of the thermal load on the thermal deformation of a mirror. The result of theoretical calculations and finite-element analysis are consistent, which proves the feasibility of the method. The root mean square of the curvatures of the thermal deformation of the white-beam mirror over the entire photon energy range can be minimized. This method greatly simplifies the design work of water-cooled white-beam mirrors. (Source: Journal of Synchrotron Radiation)
Source: Journal of Synchrotron Radiation - July 29, 2022 Category: Physics Authors: Wang, S. Zhang, D. Li, M. Gao, L. Chen, M. Yang, F. Sheng, W. Tags: thermal deformation optimization white-beam mirror entire photon energy range finite-element analysis research papers Source Type: research
AXEAP: a software package for X-ray emission data analysis using unsupervised machine learning
The Argonne X-ray Emission Analysis Package (AXEAP) has been developed to calibrate and process X-ray emission spectroscopy (XES) data collected with a two-dimensional (2D) position-sensitive detector. AXEAP is designed to convert a 2D XES image into an XES spectrum in real time using both calculations and unsupervised machine learning. AXEAP is capable of making this transformation at a rate similar to data collection, allowing real-time comparisons during data collection, reducing the amount of data stored from gigabyte-sized image files to kilobyte-sized text files. With a user-friendly interface, AXEAP includes data pr...
Source: Journal of Synchrotron Radiation - July 21, 2022 Category: Physics Authors: Hwang, I.-H. Solovyev, M.A. Han, S.-W. Chan, M.K.Y. Hammonds, J.P. Heald, S.M. Kelly, S.D. Schwarz, N. Zhang, X. Sun, C.-J. Tags: AXEAP XES unsupervised machine learning user-friendly interface computer programs Source Type: research
Pump – probe capabilities at the SPB/SFX instrument of the European XFEL
Pump – probe experiments at X-ray free-electron laser (XFEL) facilities are a powerful tool for studying dynamics at ultrafast and longer timescales. Observing the dynamics in diverse scientific cases requires optical laser systems with a wide range of wavelength, flexible pulse sequences and different pulse durations, especially in the pump source. Here, the pump – probe instrumentation available for measurements at the Single Particles, Clusters, and Biomolecules and Serial Femtosecond Crystallography (SPB/SFX) instrument of the European XFEL is reported. The temporal and spatial stability of this instrumentation is ...
Source: Journal of Synchrotron Radiation - July 21, 2022 Category: Physics Authors: Koliyadu, J.C.P. Letrun, R. Kirkwood, H.J. Liu, J. Jiang, M. Emons, M. Bean, R. Bellucci, V. Bielecki, J. Birnsteinova, S. de Wijn, R. Dietze, T. E, J. Gr ü nert, J. Kane, D. Kim, C. Kim, Y. Lederer, M. Manning, B. Mills, G. Morillo, L.L. Reimers, N. Rom Tags: pump – probe experiments European XFEL megahertz pump and probe sources time-resolved experiments beamlines Source Type: research
Environmental control for X-ray nanotomography
The acquisition speed and spatial resolution of X-ray nanotomography have continuously improved over the last decades. Coherent diffraction-based techniques breach the 10 nm resolution barrier frequently and thus pose stringent demands on sample positioning accuracy and stability. At the same time there is an increasing desire to accommodate in situ or operando measurements. Here, an environmental control system for X-ray nanotomography is introduced to regulate the temperature of a sample from room temperature up to 850 ° C in a controlled atmospheric composition. The system allows for a 360 ° sample rotation, pe...
Source: Journal of Synchrotron Radiation - July 21, 2022 Category: Physics Authors: Holler, M. Aidukas, T. Heller, L. Appel, C. Phillips, N.W. M ü ller-Gubler, E. Guizar-Sicairos, M. Raabe, J. Ihli, J. Tags: in situ nano-tomography ptychographic tomography ptychography environmental control research papers Source Type: research
Double-multilayer monochromators for high-energy and large-field X-ray imaging applications with intense pink beams at SPring-8 BL20B2
In this study, double-multilayer monochromators that generate intense, high-energy, pink X-ray beams are designed, installed and evaluated at the SPring-8 medium-length (215 m) bending-magnet beamline BL20B2 for imaging applications. Two pairs of W/B4C multilayer mirrors are designed to utilize photon energies of 110 keV and 40 keV with bandwidths of 0.8% and 4.8%, respectively, which are more than 100 times larger when compared with the Si double-crystal monochromator (DCM) with a bandwidth of less than 0.01%. At an experimental hutch located 210 m away from the source, a large and uniform beam of size 14 ...
Source: Journal of Synchrotron Radiation - July 15, 2022 Category: Physics Authors: Koyama, T. Senba, Y. Yamazaki, H. Takeuchi, T. Tanaka, M. Shimizu, Y. Tsubota, K. Matsuzaki, Y. Kishimoto, H. Miura, T. Shimizu, S. Saito, T. Yumoto, H. Uesugi, K. Hoshino, M. Yamada, J. Osaka, T. Sugahara, M. Nariyama, N. Ishizawa, Y. Nakano, H. Saji, C. Tags: double-multilayer monochromator multilayer mirror high energy X-ray imaging large field of view beamlines Source Type: research
Coupling between γ -irradiation and synchrotron-radiation-based XAFS techniques for studying Mn-doped ZnO nanoparticles
γ -Irradiation and synchrotron-radiation-based X-ray absorption fine-structure (XAFS) spectroscopy have been used to induce structure disorder through the interaction of γ -rays (200 kGy) with fabricated Mn-doped ZnO nanoparticles (NPs) and then to examine thoroughly the resultant structural change. The extracted electronic/fine XAFS structural parameters reflect a compositional and γ -irradiation co-dependence. The average crystal structure of samples prepared by the sol-gel method was investigated by X-ray diffraction (XRD). A detailed structural XRD data analysis was carried out by applying a Rietveld refinement ...
Source: Journal of Synchrotron Radiation - July 15, 2022 Category: Physics Authors: Imam, N.G. Harfouche, M. Azab, A.A. Solyman, S. Tags: synchrotron radiation γ -ray irradiation XAFS XANES pre-edge fitting LCF EXAFS XRD Rietveld refinement magnetism Mn-doped ZnO SESAME research papers Source Type: research
Multimodal X-ray probe station at 9C beamline of Pohang Light Source-II
In this study, the conceptual design and performance of a multimodal X-ray probe station recently installed at the 9C coherent X-ray scattering beamline of the Pohang Light Source-II are presented. The purpose of this apparatus is to measure coherent X-ray diffraction, X-ray fluorescence and electrical properties simultaneously. A miniature vacuum probe station equipped with a four-point probe was mounted on a six-axis motion hexapod. This can be used to study the structural and chemical evolution of thin films or nanostructures, as well as device performance including electronic transport properties. This probe station al...
Source: Journal of Synchrotron Radiation - June 27, 2022 Category: Physics Authors: Ham, D. Lee, S.Y. Choi, S. Oh, H.J. Noh, D.Y. Kang, H.C. Tags: multimodal X-ray probe in situ X-ray diffraction four-point probe station electrical property beamline beamlines Source Type: research
