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Title: YM112 - PD-LasVegas-shaum.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the no event held February 5, 2007 in las vegas, NV.
Country of Publication:
United States

Citation Formats

Shaum, Raymond W. YM112 - PD-LasVegas-shaum.. United States: N. p., 2007. Web.
Shaum, Raymond W. YM112 - PD-LasVegas-shaum.. United States.
Shaum, Raymond W. Thu . "YM112 - PD-LasVegas-shaum.". United States. doi:.
title = {YM112 - PD-LasVegas-shaum.},
author = {Shaum, Raymond W.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}

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  • Electron-yield XAFS measurements using the NSLS were made on e-beam evaporated Co/Pd multilayers with various sublayer thicknesses and different thickness ratios of Co to Pd sublayers. The Co K-edge and the Pd K-edge XAFS data were obtained for the Co/Pd multilayers with sublayer thicknesses of 3[Angstrom]/ 4[Angstrom], 15[Angstrom]/4[Angstrom], 3[Angstrom]/15[Angstrom], 2.1[Angstrom]/13.5[Angstrom], and 2.2[Angstrom]/4.5[Angstrom]. Fourier transforms of Co K XAFS for most samples show a splitting of major peak, and the magnitude ratio of these split peaks varies systematically with the thickness ratio of the Pd sublayer to the Co sublayer, whereas the Fourier transforms of the Pd K XAFS for themore » same samples do not show a splitting of peaks. As a preliminary analysis, the Co K XAFS and the split peaks in the Fourier transform for the Co/Pd(3[Angstrom]/4[Angstrom]) case were simulated by using the FEFF calculations, and the Co K XAFS and the major peak in the fourier transform for the Co/Pd(15[Angstrom]/4[Angstrom]) case were also simulated consistently.« less
  • Carbon monoxide chemisorption on transition metal surfaces has been one of the most extensively studied in surface science in past years due to its importance in a variety of catalytic processes, especially, automotive catalytic converters using Pt or Pd. The authors have performed ab initio studies to understand the electronic and geometric aspects of the Pd-CO bond in small carbonyl clusters and the CO covered (2 x 1)p2mg superstructure of the Pd(110) surface. They have used the standard quantum chemistry package Gaussian to study the former system and a LDA (local density approximation) formalism using ab initio pseudopotentials and amore » plane wave basis to study the latter. The latter results are preliminary; the authors intended to study thicker slabs in the future. The organization of the paper is as follows. The authors describe the methods used in their calculation in Sec. 2. In Sec. 3, they present results and discussion; here, they first look at the smallest possible clusters, viz, Pd{sub 2} and PdCO, take a brief look at the orbital chemistry involved and then move on to the study of the CO covered Pd(110) surface and examine the geometry of the near equilibrium structure.« less
  • New emissions regulations require that automotive emissions systems perform at high efficiencies for 100,000 miles. However, fuels containing sulfur can reduce the efficiency of catalyst formulations. Here, dynamometer-based catalyst durability testing and evaluations were used to determine the effects of fuel sulfur levels on Pd-only, Tri-Metal, Pt/Rh and Pd/Rh catalysts, at 4K and 100K of dynamometer aging using 34, 260 or 587 ppmS in the fuel. Results indicate that catalyst performance deteriorated with sulfur contamination. The sensitivity to sulfur level was in the following order: Pt/Pd/Rh<
  • Bulk amorphous Pd-Ni-P and Pd-Cu-P alloy rods with diameters 7-25 mm were synthesized over a wide composition range using a fluxing technique. For most bulk amorphous Pd-Ni-P alloys, the difference {Delta}T=T{sub x}-T{sub g} between the crystallization temperature T{sub x} and the glass transition temperature T{sub g} is larger than 90 K, while for bulk amorphous Pd-Cu-P alloys, {Delta}T varies from 27 to 73 K. Pd{sub 40}Ni{sub 40}P{sub 20} has the highest glass formability, and 300-g bulk amorphous cylinders, 25mm dia and 50mm long, can be easily produced. This size is not an upper limit. The paper presents the glass formationmore » ranges for both ternary alloy systems and data on the thermal stability of the amorphous alloys, as well as their specific heat, density, and elastic properties.« less
  • Differential cross sections and spin observables A{sub y}, iT{sub 11}, T{sub 20}, and T{sub 22} are calculated for the pd {yields} {sup 3}H{pi}{sup +} reaction in a pp {yields} d{pi}{sup +} model at energies near threshold. The results are compared with experimental data for the reactions {rvec p}d {yields} {sup 3}He{pi}{sup 0} and {rvec d}p {yields} {sup 3}He{pi}{sup 0}. Good agreement of these predictions with the data for the proton analyzing power is obtained, and for most of the other observables satisfactory agreement is found. Effects of various assumptions in the model are investigated and discussed.