A5048781999- Advanced X-ray Imaging Techniques
- Crystallography and Radiation Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Electron Microscopy Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced X-ray and CT Imaging
- Nuclear materials and radiation effects
- High-pressure geophysics and materials
- X-ray Diffraction in Crystallography
- Advanced Chemical Physics Studies
- Medical Imaging Techniques and Applications
- Surface and Thin Film Phenomena
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Superconducting Materials and Applications
- Force Microscopy Techniques and Applications
- Plant Molecular Biology Research
- Spectroscopy and Chemometric Analyses
- Radiation Detection and Scintillator Technologies
- Pulsars and Gravitational Waves Research
- Optical Imaging and Spectroscopy Techniques
- Effects and risks of endocrine disrupting chemicals
- Dye analysis and toxicity
- Luminescence Properties of Advanced Materials
Jagiellonian University
2011-2024
SOLARIS National Synchrotron Radiation Centre
2024
Institute of Physics
2002-2023
Deutsches Elektronen-Synchrotron DESY
2001-2002
Abstract The SOLARIS synchrotron located in Krakow, Poland, is a third-generation light source operating at medium electron energy. first was observed 2015, and the consequent development of infrastructure lead to users’ experiments soft X-ray energies 2018. Presently, expands its operation towards hard X-rays with continuous developments beamlines concurrent infrastructure. In following, we will summarize design, describe research together main performance parameters, upgrade, plans.
X-ray fluorescence holography (XFH) is an atomic structure determination technique that combines the capabilities of diffraction and spectroscopy. It provides a unique means gaining fully three-dimensional information about local lattice site positions selected elements inside compound samples. In this work, we discuss experimental theoretical aspects are essential for efficient recording analysis holograms review most recent advances in XFH. We describe experiments performed with brilliant...
We have observed a strong (2%) angular modulation of the total backscattered conversion electron yield, measured as function incidence angle 14.4 keV $\ensuremath{\gamma}$ rays from ${}^{57}\mathrm{Co}$ M\"ossbauer source irradiating thin epitaxial ${}^{57}\mathrm{Fe}$ film grown on MgO(001). The 2D pattern is first hologram local surrounding absorbing nuclei obtained due to nuclear resonant scattering rays. real space holographic reconstruction shows distinct features corresponding nearest...
Point projection is a mature geometry of x-ray imaging that implemented in scientific and industrial applications. Objects to be imaged are placed near microscopic source, the magnification accomplished by propagation towards distant detector. The source size trade-off between signal level spatial resolution. In this work, we demonstrate multipoint-projection realized with an tube compound structured microcapillary optics generates nearly one thousand submicrometer secondary sources....
Polycapillary x-ray focusing devices are built from hundreds of thousands bent microcapillaries that stacked into hexagonal arrays. We show intrinsic point defects the optics (e.g., missing or larger capillaries) lead to formation multiple images an object positioned in focal plane. These can be recorded parallel, and provide spatial resolution is limited by defect size not spot size. In a proof-of-principle experiment, we demonstrate submicron resolution, which has yet been achieved with...
Secondary extinction effects in x-ray holography with internal atomic reference are examined the frame of multiple-scattering power transfer equations for a mosaic crystal. The calculations compared experimental holograms an imperfect ${\mathrm{Cu}}_{3}\mathrm{Au}$ single crystal measured using fluorescence and total electron yields. It is shown that crystals can influence reconstructed real-space images atom-resolving holography.
A new technique for high fidelity three-dimensional imaging of atomic structure with gamma-ray holography is demonstrated. complex hologram was constructed from holograms recorded different values the nuclear scattering amplitude on both sides (57)Fe Mössbauer resonance. The holographic reconstruction applied to this resulting in a twin-image-free image bcc Fe local structure. proposed procedure allows removal twin images all real space, making an unambiguous tool and magnetic imaging.
We present a method for x-ray imaging of objects inside the focal spot polycapillary optics that resolves details smaller than dimensions. This employs coded aperture imaging, in which micro-structure is treated as coding pattern. Projection object decoded from magnified image structure specifically sharpened by object. Field view can be extended scanning across spot.
Complex gamma-ray holograms were recorded by tuning to the nuclear absorption lines of 57Fe in magnetite corresponding different hyperfine fields. The numerical reconstruction real space provided three-dimensional images local iron arrangements octahedral and tetrahedral sublattices magnetite. This direct site-selective imaging atomic structure was performed using a tabletop experimental setup.
In x-ray coded aperture microscopy with polycapillary optics (XCAMPO), the microstructure of focusing is used as a and enables depth-resolved imaging at resolution better than focal spot dimensions. Improvements in development 3D encoding procedures require simulation model that can predict outcome XCAMPO experiments. this work we introduce image formation which calculation datasets for arbitrary positions object relative to plane well incorporate imperfections. model, exit surface treated...
The first real-space x-ray image of an atomic structure was obtained by illuminating a crystal with white synchrotron radiation. internal photocurrent signal served as probe the interference field strength at sites and accordingly measured function illumination direction to record two-dimensional image. This novel method imaging makes use fact that intensity is energy independent respect contributions from those scattering atoms which are brought via sample rotation into forward condition....
A direct nondiffractive tomographic algorithm is proposed for the determination of crystal structure from real-space projections obtained by illuminating sample with white x rays. This approach was applied to pattern directional fine in absorption rays recorded a GaP and allowed electron density distribution within unit cell.
Plenoptic cameras use arrays of microlenses to capture multiple views the same scene in a single compound image. They enable refocusing on different planes and depth estimation. However, until now, all types plenoptic computational imaging processes have been limited visible light. We demonstrate an x-ray microscope that uses concentrating microcapillary array instead microlens can simultaneously acquire from one hundred thousand projections imaged volumes are located focal spot region...
We demonstrate layer-by-layer x-ray microimaging using polycapillary optics. The depth resolution is achieved without sample or source rotation and in a way similar to classical tomography laminography. method takes advantage from large angular apertures of optics their specific microstructure, which treated as coded aperture. imaging geometry compatible with polychromatic sources scanning confocal fluorescence setups.
Abstract Polycapillary devices focus X-rays by means of multiple reflections in arrays bent glass capillaries. The size the focal spot (typically 10–100 μ m) limits resolution scanning, absorption and phase-contrast X-ray imaging using these devices. At expense a moderate resolution, polycapillary elements provide high intensity are frequently used for micro-imaging with both synchrotrons tubes. Recent studies have shown that internal microstructure such an optics can be as coded aperture...
Synchrotrons are brilliant sources of X-ray radiation used in a variety methods to study the structure matter and dynamics processes on atomic scale. spectroscopy at synchrotrons typically combined with beam monochromatization which guarantees better energy resolution but also reduces orders magnitude photon flux incident sample thus wastes vast majority photons produced. Here we report commissioning an spectrometer PolyX beamline SOLARIS specialized application white, broadband...
We discuss directional fine structure in absorption of white x rays for tomographic imaging crystal at the atomic level. The interference between a direct x-ray beam and secondary waves coherently scattered inside specimen modifies total wave field position absorbing atoms. For beam, variations cancel out by energy integration all directions, except near forward scattering components, coinciding with incident beam. Therefore, two-dimensional patterns angular-dependent can be interpreted as...
We propose and verify in an experiment a wavelet transform approach for analysis of x-ray absorption anisotropy (XAA) patterns recorded using broadband polychromatic beam. XAA results from the interference between incident plane wave with spherical waves scattered atoms inside sample. This modifies total field amplitude at sites absorbing effectively changes atomic cross section. is monitored by measuring secondary yield while sample rotated relative to incident-beam direction. For hard...
Projections of the atomic structure around Nb atoms in a LiNbO 3 single crystal were obtained from white-beam X-ray absorption anisotropy (XAA) pattern detected using K fluorescence. This kind results interference X-rays inside sample and, owing to short coherence length white beam, is visible only at small angles interatomic directions. Consequently, main features recorded XAA corresponded distorted real-space projections dense-packed planes and rows. A quantitative analysis was carried out...
The prospects of atomic structure imaging with the continuous spherical wavelet transform (CSWT) as applied to white beam x-ray fluorescence holograms (XFH) are discussed. Recording XFH a eliminates holographic twin images and minimizes extinction effects. However, lack these parasitic effects is accompanied by limited radial resolution. In this work, introducing an approximation spectrum based on Gumbel distribution, we propose improvement both in generation data analysis. Using approximate...
White-beam x-ray fluorescence holograms were recorded using a 50 watt tube for Cu${}_{3}$Au single crystal. Element sensitivity this model sample was explicitly demonstrated by measuring distinct Cu K and Au L fluorescence. The phase of the enabled us to obtain projections local atomic structure image electron density within unit cell, relative either or atoms. Since experimental setup does not require any optics angular resolution requirements are loose, application more powerful laboratory...