A5028780361- X-ray Spectroscopy and Fluorescence Analysis
- Advanced X-ray Imaging Techniques
- Advanced X-ray and CT Imaging
- Nuclear Physics and Applications
- Cardiac Imaging and Diagnostics
- Silicon and Solar Cell Technologies
- Electron and X-Ray Spectroscopy Techniques
- Medical Imaging Techniques and Applications
- Advanced MRI Techniques and Applications
- Thin-Film Transistor Technologies
- Quantum Chromodynamics and Particle Interactions
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Nuclear physics research studies
- X-ray Diffraction in Crystallography
- Particle physics theoretical and experimental studies
- Semiconductor materials and interfaces
- Atomic and Molecular Physics
- Superconducting Materials and Applications
- Crystallography and Radiation Phenomena
- Radioactivity and Radon Measurements
- Diamond and Carbon-based Materials Research
- Particle Accelerators and Free-Electron Lasers
- Silicon Nanostructures and Photoluminescence
- Semiconductor materials and devices
European Molecular Biology Laboratory
2023
Lawrence Berkeley National Laboratory
1994-2007
Lawrence Livermore National Laboratory
1998
European Synchrotron Radiation Facility
1998
University of California, Berkeley
1981-1997
Edison International (United States)
1996
Argonne National Laboratory
1968-1993
Stanford University
1981-1986
Carnegie Mellon University
1968-1982
Binghamton University
1976
Extended x-ray-absorption fine-structure measurements have been made on metal clusters of Cu and Ni which were formed by vapor deposition amorphous carbon substrates. Small both elements show a substantial contraction the nearest-neighbor metal-metal distance an increase in binding energy for onset $K$ absorption edge. The results are explained increasing surface-to-volume ratio as cluster size decreases resulting more free-atom---like configuration atoms.
The risks and costs of the present method visualizing coronary arteries have limited use angiography in long-term serial studies needed to establish natural history atherosclerosis its response interventions. A less invasive method, which contrast agent is administered intravenously, has been developed using synchrotron radiation as illuminating source. report describes initial results human subjects. findings indicate that transvenous angiograms can be acquired this manner. Further...
We have measured muonic x rays in the energy region 150 to 440 keV nine elements with an absolute precision of 15 21 eV for transitions small nuclear effects. Calculated transition energies were found be consistently larger than those by amount that varied from \ifmmode\pm\else\textpm\fi{} 16 at 157 137 22 438 keV. For these transitions, principal correction Dirac is vacuum polarization. The discrepancy, however, lies outside expected validity quantum-electrodynamic calculations and we are...
Graphite is oxidized by O2+AsF6– and OsF6 to give first-stage graphite salts C8+MF6–; S2O6F2 oxidizes both boron nitride yield the C12+-SO3F– (BN)4+SO3F–, latter being first example of a salt.
A synchrotron radiation based x-ray microprobe analytical technique, beam induced current (XBIC), is suggested and demonstrated at the Advanced Light Source Lawrence Berkeley National Laboratory. The principle of XBIC similar to that electron/laser with difference minority carriers are generated by a focused beam. can be combined any other tool, such as fluorescence (μ-XRF), complement chemical information data on recombination activity impurities defects. Since signal, which carries about...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNondestructive x-ray fluorescence spectrometry for determination of trace elements along a single strand hairT. Y. Toribara, David A. Jackson, Walter R. French, C. Thompson, and J. M. JaklevicCite this: Anal. Chem. 1982, 54, 11, 1844–1849Publication Date (Print):September 1, 1982Publication History Published online1 May 2002Published inissue 1 September...
Results of an experiment to measure muonic transition energies in separated lead isotopes are presented. The main results as follows: 1. Muonic spectra the four $^{204}\mathrm{Pb}$, $^{206}\mathrm{Pb}$, $^{207}\mathrm{Pb}$, and $^{208}\mathrm{Pb}$ were studied with high resolution. No anomalous splitting or broadening lines was detected. effect natural linewidth could, however, be observed. 2. An anomaly found $3d$ fine structure whose measured value turned out larger than calculated by...
Impurity and minority carrier lifetime distributions were studied in as-grown multicrystalline silicon used for terrestrial-based solar cells. Synchrotron-based x-ray fluorescence the light beam induced current technique to measure impurity distributions, respectively. The purpose of this work was determine spatial relation between transition metal impurities recombination Our results reveal a direct correlation chromium, iron, nickel precipitates with regions high recombination....
In this study, we have utilized characterization methods to identify the nature of metal impurity precipitates in low performance regions multicrystalline silicon solar cells. Specifically, synchrotron-based x-ray fluorescence and absorption spectromicroscopy study elemental chemical these precipitates, respectively. We detected nanometer-scale Fe, Cr, Ni, Cu, Au materials from a variety cell manufacturers. Additionally, obtained direct correlation between light-induced current, providing...
The intense synchrotron radiation produced at electron storage rings provides a new source of X-rays highly suited to iodine K-edge digital subtraction angiography. high intensity and small angular divergence permit the be monochromatized by Bragg diffraction made available in beams vertical size, arbitrary horizontal width, tunable energy. use such maximum sensitivity intra-arterial virtually eliminates image contrast due non-vascular body structures. this method offers prospect visualizing...
Results for the elastic scattering of 50-MeV ${\ensuremath{\pi}}^{+}$ on $^{12}\mathrm{C}$ are presented. Contrary to experience at energies above 100 MeV, simple optical models (with parameters derived from $\ensuremath{\pi}\ensuremath{-}N$ phase shifts) give poor fits data. Forcing good yields potentials that pion producing or in violation unitarity. We conclude improved will be required describe low-energy
Muonic $K$ and $L$ x rays have been observed with a Ge(Li) detector for separated isotopes of europium. A modified Fermi charge distribution was used the analysis both nuclei. The ${\mathrm{Eu}}^{153}$ spectrum fitted by assuming validity rotation model; ${\mathrm{Eu}}^{151}$, excitation to only low-lying 21.7-keV state invoked. yields values several level parameters that agree well available data.
Abstract Tilapia Lake Virus (TiLV), a recently discovered pathogen of tilapia fish, belongs to the Amnoonviridae family from Articulavirales order. Its ten genome segments have characteristic conserved ends and encode proteins with no known homologues, apart segment 1, which encodes an orthomyxo-like RNA-dependent-RNA polymerase core subunit. Here we show that 1–3 respectively PB1, PB2 PA-like subunits active heterotrimeric maintains all domains found in distantly related influenza...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrace element determination using synchrotron radiationRobert D. Giauque, Joseph M. Jaklevic, and Albert C. ThompsonCite this: Anal. Chem. 1986, 58, 4, 940–944Publication Date (Print):April 1, 1986Publication History Published online1 May 2002Published inissue 1 April 1986https://pubs.acs.org/doi/10.1021/ac00295a060https://doi.org/10.1021/ac00295a060research-articleACS PublicationsRequest reuse permissionsArticle Views85Altmetric-Citations25LEARN...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMeasurement of femtogram quantities trace elements using an x-ray microprobeRobert D. Giauque, Albert C. Thompson, James H. Underwood, Yan. Wu, Keith W. Jones, and Mark L. RiversCite this: Anal. Chem. 1988, 60, 9, 855–858Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 1988https://pubs.acs.org/doi/10.1021/ac00160a007https://doi.org/10.1021/ac00160a007research-articleACS PublicationsRequest reuse...
This is a study of the use dual-beam, dual-detector synchrotron radiation system for transvenous coronary angiography in human subject. eliminates need rapid beam switching, increases X-ray fluence by factor about 2.5, and makes it possible to record high- low-energy images simultaneously, thus excluding artifacts arising from time subtraction. Besides angiography, may be image vertebral-basilar arterial circulation with this system.
A study of the inclusive reaction ${\ensuremath{\pi}}^{+}+A\ensuremath{\rightarrow}X+\mathrm{anything}$ has been analyzed for 235-MeV pions and Mg, Ni, Ag targets with $X=p, d, t, ^{3}\mathrm{He}, \mathrm{and} ^{4}\mathrm{He}$ in energy range 15-400 MeV. The cross section proton emission is found to be as much a factor 8 less than that predicted by intranuclear-cascade calculations. complex-particle-emission sections are consistent nucleon-pickup mechanism.