Direct Comparison of the X-Ray Emission and Absorption of Cerium Oxide

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Bremstrahlung Isochromat Spectroscopy (BIS). The XES spectra were collected using a Specs electron gun for the excitation and the XES 350 grating monochromator and channel plate system from Scienta as the photon detection. Spectra were collected in 'normal mode,' where the electron gun kinetic energy (KE) and the energy position of the center of the channel plate were both fixed and the energy distribution in the photon (hv) spectrum was derived from the intensities distributed across the channel plate detector in the energy dispersal direction. The polycrystalline Ce sample was oxidized by exposure to air at ambient pressures. After introduction ... continued below

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Tobin, J G; Yu, S W; Chung, B W; Waddill, G D & Denlinger, J D November 24, 2010.

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Bremstrahlung Isochromat Spectroscopy (BIS). The XES spectra were collected using a Specs electron gun for the excitation and the XES 350 grating monochromator and channel plate system from Scienta as the photon detection. Spectra were collected in 'normal mode,' where the electron gun kinetic energy (KE) and the energy position of the center of the channel plate were both fixed and the energy distribution in the photon (hv) spectrum was derived from the intensities distributed across the channel plate detector in the energy dispersal direction. The polycrystalline Ce sample was oxidized by exposure to air at ambient pressures. After introduction to the ultra-high vacuum system, the oxidized sample was bombarded with Ar, to clean the topmost surface region and stabilize the surface and near surface regions. Although CeO{sub 2} would be the thermodynamically preferred composition in an oxygen rich environment, the combination of a vacuum environment and ion etching may have driven the near surface region into a Ce{sub 2}O{sub 3} stoichiometry. XES data collection occurred with the sample at or near room temperature. The base pressure of the system was 3 x 10{sup -10} torr, but the pressure changed depending the energy and current of the electron gun. For example, with the XES measurements at KE = 3KeV, the pressure was approximately 8 to 9 x 10{sup -10} torr and the excitation current to the sample was typically 0.01 mA. More detail of the sample preparation and analysis can be found in Reference 1. The XAS experiments were performed at Beamline 8 of the Advance Light Source, as part of a larger collaboration. The ex situ sample used at the ALS was prepared in a fashion similar to that described above. X-ray Emission Spectroscopy (XES) and X-ray Absorption Spectroscopy (XAS), have been used to investigate the photon emission and absorption associated with the Ce3d{sub 5/2} and Ce3d{sub 3/2} core-levels in CeOxide. A comparison of the two processes and their spectra will be made. Recently, we reported the observation of a very strong resonant effect in the Resonant Inverse Photoelectron Spectroscopy of CeOxide. It has now become apparent that there is a utility in a direct comparison of the X-ray Emission Spectroscopy (XES) and X-ray Absorption Spectroscopy (XAS) of similarly prepared CeOxide samples. That comparison is made in this Brief Report/Comment.

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PDF-file: 10 pages; size: 0.8 Mbytes

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  • Journal Name: Journal of Vacuum Science and Technology A, vol. 29, no. 3, March 14, 2011, pp. 031504; Journal Volume: 29; Journal Issue: 3

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  • Report No.: LLNL-JRNL-463677
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1018443
  • Archival Resource Key: ark:/67531/metadc833404

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  • November 24, 2010

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  • May 19, 2016, 3:16 p.m.

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  • Nov. 23, 2016, 4 p.m.

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Tobin, J G; Yu, S W; Chung, B W; Waddill, G D & Denlinger, J D. Direct Comparison of the X-Ray Emission and Absorption of Cerium Oxide, article, November 24, 2010; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc833404/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.