A5030246000- Advanced X-ray Imaging Techniques
- Physics of Superconductivity and Magnetism
- X-ray Spectroscopy and Fluorescence Analysis
- Enzyme Structure and Function
- Electron and X-Ray Spectroscopy Techniques
- Protein Structure and Dynamics
- Copper-based nanomaterials and applications
- Advanced Electron Microscopy Techniques and Applications
- Magnetic Properties and Applications
- Superconducting Materials and Applications
- ZnO doping and properties
- Rare-earth and actinide compounds
- Iron-based superconductors research
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Superconductivity in MgB2 and Alloys
- Inorganic Fluorides and Related Compounds
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Medical Imaging Techniques and Applications
- Microstructure and Mechanical Properties of Steels
Oak Ridge National Laboratory
2024
Brookhaven National Laboratory
2014-2021
Office of Basic Energy Sciences
2021
Argonne National Laboratory
1992-2011
Northern Illinois University
1996-1997
University of Illinois Chicago
1992-1994
University of Illinois Urbana-Champaign
1992
Northeastern University
1992
We characterize the nature of Van Hove singularity near Fermi energy (${E}_{F}$) in Y${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{4}$${\mathrm{O}}_{8}$ using ultrahigh resolution (10 meV) angle-resolved photoemission spectroscopy, together with corresponding first-principles spectra intensity computations. The singularity, related to Cu${\mathrm{O}}_{2}$ planes, is located about 19 meV below ${E}_{F}$ at $Y$ point Brillouin zone and arises from a band which nearly dispersionless along...
Full field transmission X-ray microscopy (TXM) is a powerful technique for non-destructive 3D imaging with nanometer-scale spatial resolution. However, to date, the typical acquisition time hard TXM at synchrotron facility >10 min nano-tomography dataset sub-50 nm This significant limit on types of dynamics that can be investigated using this technique. Here, we present demonstration one-minute achievement made possible an in-house designed and commissioned instrument Full-field...
Hard X-ray microscopy is a prominent tool suitable for nanoscale-resolution non-destructive imaging of various materials used in different areas science and technology. With an ongoing effort to push the 2D/3D resolution down 10 nm hard regime, both fabrication nano-focusing optics stability microscope using those become extremely challenging. In this work system designed constructed accommodate multilayer Laue lenses as nanofocusing presented. The developed apparatus has been thoroughly...
A scintillator-based Timepix3 (TPX3) detector was developed to resolve the high-frequency modulation of a neutron beam in both spatial and temporal domains, as required for spin-echo experiments. In this system, light from scintillator is manipulated with an optical lens intensified using image intensifier, making it detectable TPX3 chip. Two different scintillators, namely, 6LiF:ZnS(Ag) 6LiI:Eu, were investigated achieve high resolution needed modulated small-angle scattering (SEMSANS)...
A transmission X-ray microscope has been designed and commissioned at the 18-ID Full-field Imaging beamline National Synchrotron Light Source II. This instrument operates in 5-11 keV range, and, with current set of optics, is capable 30 nm spatial resolution imaging, a field view about 40 μm. For absorption contrast, minimum exposure time for single projection image 20 ms an entire 3D tomography data can be acquired under 1 min. The system enables tomographic reconstructions sub-50 without...
Ultrahigh-resolution (\ensuremath{\Delta}E up to 10 meV) angle-resolved photoemission spectroscopy on single crystals of ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8+\mathrm{\ensuremath{\delta}}}$ (Bi-2212) show a highly anisotropic superconducting energy gap: the gap is minimized, with value close zero, along \ensuremath{\Gamma}-X and \ensuremath{\Gamma}-Y symmetry directions, while large (\ensuremath{\Delta}=22 observed...
We report an ultrahigh-resolution photoemission study of ${\mathrm{Rb}}_{3}$${\mathrm{C}}_{60}$ single crystals (${\mathit{T}}_{\mathit{c}}$=30.5 K) and the measurement superconducting energy gap. The were cleaved at 13 K to expose (111) plane. They show a sharp Fermi cutoff above ${\mathit{T}}_{\mathit{c}}$ gap opening below (2\ensuremath{\Delta}/${\mathit{k}}_{\mathit{B}}$${\mathit{T}}_{\mathit{c}}$\ensuremath{\sim}4.1 K). valence band shows \ensuremath{\sim}0.15-eV-wide near...
Crystal harvesting has proven to be difficult automate and remains the rate-limiting step for many structure-determination high-throughput screening projects. This resulted in crystals being prepared more rapidly than they can harvested X-ray data collection. Fourth-generation synchrotrons will support extraordinarily rapid rates of acquisition, putting further pressure on crystal-harvesting bottleneck. Here, a simple solution is reported which acoustically from slightly modified MiTeGen In...
A novel motion control system which utilizes the Power PMAC controller from Delta Tau Data Systems Inc., has been developed for positioning with 1 nm spatial resolution. Present work is a significant step forward towards commissioning of X-ray microscope will operate at Hard Nanoprobe (HXN) beamline NSLS-II. The capable performing high-speed / high-accuracy on-the-fly scans sample respect to nano-focusing optics e.g. Multilayer Laue Lenses (MLL) or Fresnel Zone Plates (ZP) [1]. controls...
Newly developed 3D reconstruction technology has many uses ranging from facial recognition, self-driving vehicles, and producing accurate models of samples. To utilize reconstruction, a depth map the sample must be generated series images. This can done using stereoscopic 3D, or in case fixed camera (such as 10ID On-Axis Microscope at NSLS-II used for this paper) through focus stacking. paper will explain how stacking to generate in-focus images very shallow fields, merge these create maps models.
The SPDC of X-rays via nonlinear Bragg diffraction from a diamond crystal is explored at synchrotron light source. In this report we share, to the best our knowledge, record detection along with imaging applications.
Quantum imaging encompasses a broad range of methods that exploit the quantum properties light to capture information about an object. One such approach involves using two-photon state, where only one photon interacts with object being imaged while its entangled partner carries spatial or temporal information. To implement this technique, it is necessary generate specific states and detect photons at single-photon level. While method has been successfully demonstrated in visible...
A novel on-axis X-ray microscope with 3 µm resolution, 3x magnification, and a working distance of 600 mm for in-situ sample alignment beam visualization the Inelastic Scattering (IXS) beamline at NSLS-II is presented. The uses reflective optics, which minimizes dispersion, allows imaging from Ultraviolet (UV) to Infrared (IR) specifically chosen objective components (coatings, etc.). Additionally, portable high resolution KB mirror characterization was developed.