Search Results - "Elam, W. T"

Origins of extreme broadening mechanisms in near-edge x-ray spectra of nitrogen compounds by Vinson, John, Jach, Terrence, Elam, W. T., Denlinger, J. D.

“…We demonstrate the observation of many-body lifetime effects in valence-band x-ray emission. A comparison of the N K alpha emission of crystalline ammonium…”
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Avoiding slush for hot-point drilling of glacier boreholes by Hills, Benjamin H., Winebrenner, Dale P., Elam, W. T., Kintner, Paul M. S.

“…Water-filled boreholes in cold ice refreeze in hours to days, and prior attempts to keep them open with antifreeze resulted in a plug of slush effectively…”
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X-ray Emission Spectroscopy of Nitrogen-Rich Compounds by Vila, Fernando D, Jach, Terrence, Elam, W. T, Rehr, John J, Denlinger, J. D

“…Nonresonant X-ray emission spectroscopy was used to compare the nitrogen-rich compounds ammonium nitrate, trinitrotoluene, and cyclotrimethylene−trinitramine…”
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Examination of coherent surface reflection coefficient (CSRC) approximations in shallow water propagation by WILLIAMS, Kevin L, THORSOS, Eric I, ELAM, W. T

“…The parabolic wave equation (PE) code of Rosenberg [J. Acoust. Soc. Am. 105, 144–153 (1999)] is used as a benchmark to study acoustic propagation in an ocean…”
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Speciation of chromium in simulated soil samples using X-ray absorption spectroscopy and multivariate calibration by Shaffer, R.E., Cross, J.O., Rose-Pehrsson, S.L., Elam, W.T.

“…X-ray absorption near-edge structure (XANES) spectroscopy has been applied to the speciation of 24 simulated soil samples spiked with known concentrations…”
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Pre-flight Geometric and Optical Calibration of the Planetary Instrument for X-ray Lithochemistry (PIXL) by Klevang, D. A., Liebe, C. C., Henneke, J., Jørgensen, J. L., Sharrow, R., Setterfield, T., Wade, L., Sondheim, M., Foote, M., Elam, W. T., Heirwegh, C. M., Hurowitz, J., Allwood, A.

“…The Planetary Instrument for X-ray Lithochemistry (PIXL) is a micro-focus X-ray fluorescence spectrometer that is mounted on the robotic arm of NASA’s…”
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The microcalorimeter X-ray detector: A true paradigm shift in X-ray spectroscopy by Jach, T., Ullom, J. N., Elam, W. T.

“…The microcalorimeter x-ray detector registers the heat deposited in an absorber from individual x-ray photons by means of a sensitive thermometer. It combines…”
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Micro-XRF excitation in an SEM by Haschke, M., Eggert, F., Elam, W. T.

“…Electron microscopes are often used for position‐sensitive elemental analysis of non‐homogeneous material by electron‐probe‐micro‐analysis (EPMA). Due to the…”
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On the formation of nanocrystals in the soft magnetic alloy Fe73.5Nb3Cu1Si13.5B9 by AYERS, J. D, HARRIS, V. G, SPRAGUE, J. A, ELAM, W. T, JONES, H. N

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Structural origins of magnetic anisotropy in sputtered amorphous Tb-Fe films by HARRIS, V. G, AYLESWORTH, K. D, DAS, B. N, ELAM, W. T, KOON, N. C

“…Using X-ray-absorption fine-structure measurements, clear evidence was obtained for structural anisotropy in amorphous sputter-deposited TbFe films exhibiting…”
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Chemical speciation via X-ray emission spectra by Ankudinov, A. L., Elam, W. T., Sieber, J. R., Rehr, J. J.

“…Since the early days of X‐ray spectrometry, X‐ray emission and fluorescence spectra have been used to investigate chemical speciation, e.g. the dependence on…”
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On the role of Cu and Nb in the formation of nanocrystals in amorphous Fe73.5Nb3Cu1Si13.5B9 by Ayers, J. D., Harris, V. G., Sprague, J. A., Elam, W. T.

“…Extended x-ray absorption fine structure analysis of amorphous and partially crystallized samples of the soft magnetic alloy Fe73.5Nb3Cu1Si13.5B9 reveals that,…”
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A new atomic database for X-ray spectroscopic calculations by Elam, W.T., Ravel, B.D., Sieber, J.R.

“…The authors undertook to compile a database of recent values of the atomic parameters required for fundamental parameters (FP) calculation of X-ray…”
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Critical properties of the void percolation problem for spheres by ELAM, W. T, KERSTEIN, A. R, REHR, J. J

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Transport theory for shallow water propagation with rough boundaries by Thorsos, Eric I., Henyey, Frank S., Elam, W. T., Hefner, T. Brian, Reynolds, Stephen A., Yang, Jie

“…At frequencies of about 1 kHz and higher, forward scattering from a rough sea surface (and/or a rough bottom) can strongly affect shallow water propagation and…”
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Structure determination of metastable cobalt films by IDZERDA, Y. U, ELAM, W. T, JONKER, B. T, PRINZ, G. A

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Fractal aggregates in sputter-deposited NbGe2 films by ELAM, W. T, WOLF, S. A, SPRAGUE, J, GUBSER, D. U, VAN VECHTEN, D, BARZ, G. L. JR, MEAKIN, P

“…Fractal-like structures have been observed in sputter-deposited thin films of NbGe2. These structures exhibit a striking resemblance to those produced by…”
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Polarization-dependent XAFS studies on the role of Ta in the compositional segregation of Co-Cr-Ta magnetic recording media by Kemner, K.M., Harris, V.G., Elam, W.T., Feng, Y.C., Laughlin, D.E., Woicik, J.C.

“…Extended X-ray absorption fine structure (EXAFS) measurements of Ta in Co-Cr-Ta films were performed using normal glancing incident radiation in order…”
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Performance of a Borehole X-Ray Fluorescence Spectrometer for Planetary Exploration by Kelliher, W.C., Carlberg, I.A., Elam, W.T., Willard-Schmoe, E.

“…We have designed and constructed a borehole X-ray fluorescence spectrometer (XRFS) as part of the Mars Subsurface Access program…”
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Determination of the structural anisotropy in amorphous Tb-Fe films by Harris, V.G., Aylesworth, K.D., Das, B.N., Elam, W.T., Koon, N.C.

“…The authors report the measurement and description of an anisotropy between the in-plane and out-of-plane atomic structure in as-deposited amorphous Tb-Fe…”
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