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You searched on: Author: bruce ravel Sorted by: title

Displaying records 1 to 10 of 25 records.
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1. Abiotic bromination of soil organic matter
Published: 10/15/2015
Authors: Bruce D Ravel, Alessandra C Leri
Abstract: Biogeochemical transformations of plant-derived soil organic matter (SOM) involve complex abiotic and microbially mediated reactions. One such reaction is halogenation, which occurs naturally in the soil environment and has been associated with enzym ...

2. Bromination of marine particulate organic matter through oxidative mechanisms
Published: 9/14/2014
Authors: Bruce D Ravel, Alessandra C Leri, Kathleen Thornton, Lawrence M Mayer
Abstract: Although bromine is considered conservative in seawater, it exhibits a well established correlation with organic carbon in marine sediments. This carbon-bromine association was recently attributed to covalent bonding, with organobromine in sinking pa ...

3. Combined EXAFS and First-Principles Theory Study of Pb^d1-x^Ge^dx^Te
Published: 12/1/1999
Authors: Bruce D Ravel, Eric J Cockayne, E Newville, K M Rabe
Abstract: The narrow band-gap semiconductor Pb^d1-x^Ge^dx^Te has a low-temperature ferroelectric rhombohedral phase whose average structure is a distorted rocksalt structure. We have measured the Extended X-Ray-Absorption Fine-Structure (EXAFS) spectra of Pb^ ...

4. Condensed Matter Astrophysics A Prescription for Determining the Species-Specific Composition and Quantity of Interstellar Dust using X-rays
Published: 9/10/2009
Authors: Bruce D Ravel, Julia C. Lee, Jingen Xiang, Jeffrey Kortright, Kathryn Flanagan
Abstract: We present a new technique for determining the quantity and composition of dust in astrophysical environments using < 6 keV X-rays. We argue that high resolution X-ray spectra as enabled by the Chandra and XMM-Newton gratings should be considered ...

5. Diamond Sensors and Polycapillary Lenses for X-ray Absorption Spectroscopy
Published: 10/13/2013
Author: Bruce D Ravel
Abstract: Diamond sensors are evaluated as incident beam monitors for X-ray Absorption Spectroscopy experiments. These single crystal devices pose a challenge for an energyscanning experiment using hard X-rays due to the e ect of diffraction from the crystalli ...

6. Diffraction Anomalous Fine Structure Study of Strained GA^d1-x^In^dx^As on GaAs(001)
Published: 8/20/1998
Authors: Joseph C Woicik, J O Cross, Charles E. Bouldin, Bruce D Ravel, J G Pellegrino, B W Steiner, S G Bompadre, L B Sorensen, K E Miyano, J P Kirkland
Abstract: Diffraction anomalous fine-structure measurements performed at both the Ga and As K edges have determined the Ga-As bond length to be 2.442 {+ or -} 0.005 {Angstrom} in a buried, 213 {Angstrom} thick Ga^0.78^In^d0.22^As layer grown coherently on GaAs ...

7. EXAFS Studies of Catalytic DNA Sensors for Mercury Contamination of Water
Published: 12/11/2009
Authors: Bruce D Ravel, S.C. Slimmer, X. Meng, G.C.L. Wong, Y. Lu
Abstract: Monitoring of metallic contaminants in domestic and agricultural water systems systems requires technology that is fast, flexible, sensitive, and selective. Recently, metal sensors based on catalytic DNA have been demonstrated as a practical monitor ...

8. Identification of Materials in Integrated Circuit Interconnects Using X-Ray Absorption Near Edge Spectroscopy
Published: 1/1/1999
Authors: Zachary H Levine, Bruce D Ravel
Abstract: Most integrated circuit interconnects are principally composed of a few metals, including aluminum alloyed with copper, tungsten, titanium, A1^d3^ Ti, and A1^d2^Cu, in a silica matrix. Integrated circuit interconnects have recently been proposed as ...

9. National Synchrotron Light Source II: Long Islands state-of-the-art X-ray microscope
Published: 5/20/2014
Authors: Bruce D Ravel, Scott Calvin, Linnea Russell
Abstract: This is an education and outreach effort that we have undertaken for the benefit of the Photon Sciences Users' Executive Committee. The UEC is the group that represents the user of the National Synchrotron Light Source, which is currently in its fina ...

10. Path degeneracy and EXAFS analysis of disordered materials
Published: 10/24/2014
Author: Bruce D Ravel
Abstract: The analysis of EXAFS data measured on a material with a disordered local configuration environment around the absorbing atom can be challenging due to the proliferation of photoelectron scattering paths that must be considered in the analysis. In th ...

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