A5017585540- X-ray Spectroscopy and Fluorescence Analysis
- Advanced X-ray Imaging Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Photodynamic Therapy Research Studies
- Particle Detector Development and Performance
- Electron and X-Ray Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Luminescence Properties of Advanced Materials
- Adaptive optics and wavefront sensing
- Enzyme Structure and Function
- Trace Elements in Health
- Nuclear Physics and Applications
- Alzheimer's disease research and treatments
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Crystal Structures and Properties
- Quantum Dots Synthesis And Properties
- Particle accelerators and beam dynamics
- Prion Diseases and Protein Misfolding
- Solid-state spectroscopy and crystallography
- Nanoplatforms for cancer theranostics
University of California, Berkeley
1991-2024
Brookhaven National Laboratory
2013-2024
National Synchrotron Light Source II
2024
Lawrence Berkeley National Laboratory
2022-2024
University of Edinburgh
2024
Washington State University
2000-2001
Naval Medical Center Portsmouth
1998
Prairie View A&M University
1991
University of South Alabama
1991
University of California, Los Angeles
1991
We present comprehensive broadband optical spectroscopy data on two insulating phases of vanadium dioxide $(\mathrm{V}{\mathrm{O}}_{2})$: monoclinic ${M}_{2}$ and triclinic. The main result our work is that the energy gap electronic structure are essentially unaltered by first-order structural phase transition between triclinic phases. Moreover, interband features in remarkably similar to those observed well-studied ${M}_{1}$ $\mathrm{V}{\mathrm{O}}_{2}$. As insensitive different lattice...
Fourier-transform infrared (FTIR) spectroscopic imaging is a widely used method for studying the chemistry of proteins, lipids, and DNA in biological systems without need additional tagging or labeling. This technique can be especially powerful spatially resolved, temporal studies dynamic changes such as vivo protein folding cell culture models. However, FTIR experiments have typically been limited to dry samples result significant spectral overlap between water Amide I band centered at 1650...
We report the application of lanthanide-binding tags (LBTs) for two- and three-dimensional X-ray imaging individual proteins in cells with a sub-15 nm beam. The method combines encoded LBTs, which are minimal size (ca. 15–20 amino acids) affording high-affinity lanthanide ion binding, fluorescence microscopy (XFM). This approach enables visualization LBT-tagged while simultaneously measuring elemental distribution at spatial resolution necessary visualizing cell membranes eukaryotic...
X-ray Fluorescence (XRF) microscopy is a growing approach for imaging the trace element concentration, distribution, and speciation in biological cells at nanoscale. Moreover, three-dimensional nanotomography provides added advantage of subcellular structure chemical identity three dimensions without need staining or sectioning cells. To date, technical challenges optics, sample preparation, detection sensitivity have limited use XRF this area. Here, was used to image elemental distribution...
Microspectroscopic imaging in the infrared (IR) spectral region allows for examination of spatially resolved chemical composition on microscale. More than a decade ago, it was demonstrated that diffraction-limited spatial resolution can be achieved when an apertured, single-pixel IR microscope is coupled to high brightness synchrotron light source. Nowadays, many microscopes are equipped with multipixel Focal Plane Array (FPA) detectors, which dramatically improve data acquisition times...
The development, construction, and first commissioning results of a new scanning microscope installed at the 5-ID Submicron Resolution X-ray Spectroscopy (SRX) beamline NSLS-II are reported. developed system utilizes Kirkpatrick-Baez mirrors for focusing. instrument is designed to enable spectromicroscopy measurements in 2D 3D with sub-200 nm spatial resolution. present paper focuses on design aspects, optical considerations, specifics sample stage, summarizing some initial results.
Over the last couple of decades, synchrotron radiation research community has witnessed tremendous advancement in field X-ray imaging and microscopy. Continuing enhancement light ...
We have studied the effect of pressure on stretching and bending modes (PO4)3- molecular groups in undoped Li3PO4 (MnO4)3- Mn5+-doped using Raman spectroscopy luminescence. The high-pressure study confirmed an irreversible phase transition from high-temperature to low-temperature phase, observed our previous luminescence (Riedener T, Shen Y R, Smith R J Bray K L 2000 Chem. Phys. Lett. 321 445) further characterized rate irreversibility transition. analysed vibronic transitions occurring 1E...
Synchrotron x-ray fluorescence (XRF) microprobe is a valuable analysis tool for imaging trace element composition in situ at resolution of few microns. Frequently, epifluorescence microscopy beneficial identifying the region interest. To date, combining with has involved analyses two different microscopes. We report development an module that integrated into synchrotron XRF beamline, such visible from sample can be viewed while collecting images simultaneously. This unique combination been...
High contrast imaging can use pupil apodizers to suppress diffracted starlight from a bright source in order observe its environs. Metallic half-tone dot transmissive were developed for the Gemini Planet Imager (GPI) and ESO SPHERE coronagraphs near-IR. Dot sizes on scale of wavelength light often result unexpected variations optical transmission vs. superficial density relation. We measured 5 10 micron microdot screens' transmissions between 550 -1050 nm prepare fabricate apodizations that...
The first eight insertion devices (IDs) at the NSLS-II were commissioned during fall run of 2014. In this paper we discuss commissioning synchrotron radiation protection (SRP) system and beamline frontends (FE) for respective IDs. We describe diagnostics utilized if FE a procedure that was used alignment photon beam from in frontends. Then current status SRP operation
The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven Laboratory. During spring/ summer 2014, storage ring was commissioned up to 50 mA without insertion devices. In fall we began commissioning project beamlines, which included seven devices on six ID ports. Beamlines IXS, HXN, CSX-1, CSX-2, CHX, SRX, and XPD-1 consist elliptically polarized undulator (EPU), damping wigglers (DW) in-vacuum undulators (IVU) covering from VUV...
We have developed a next-generation scanning x-ray microscope RASMI (RApid Scanning Microscopy Instrument) for high-throughput tomographic imaging. is installed at the hard nanoprobe beamline NSLS-II and capable of manipulating 1D multilayer Laue lenses (MLLs) 2D optics (both zone plates monolithically assembled MLLs). The sample stage utilizes line-focusing interferometry as an encoder while performing fly-scanning data acquisition. system can be configured both position- time-triggering...