Adsorption of Atmospheric Gases on Pu Surfaces

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Surface adsorption represents a competition between collision and scattering processes that depend on surface energy, surface structure and temperature. The surface reactivity of the actinides can add additional complexity due to radiological dissociation of the gas and electronic structure. Here we elucidate the chemical bonding of gas molecules adsorbed on Pu metal and oxide surfaces. Atmospheric gas reactions were studied at 190 and 300 K using x-ray photoelectron spectroscopy. Evolution of the Pu 4f and O 1s core-level states were studied as a function of gas dose rates to generate a set of Langmuir isotherms. Results show that the initial ... continued below

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7 p. (0.3 MB)

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Nelson, A J; Holliday, K S; Stanford, J A; Grant, W K; Erler, R G; Allen, P G et al. March 29, 2012.

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Surface adsorption represents a competition between collision and scattering processes that depend on surface energy, surface structure and temperature. The surface reactivity of the actinides can add additional complexity due to radiological dissociation of the gas and electronic structure. Here we elucidate the chemical bonding of gas molecules adsorbed on Pu metal and oxide surfaces. Atmospheric gas reactions were studied at 190 and 300 K using x-ray photoelectron spectroscopy. Evolution of the Pu 4f and O 1s core-level states were studied as a function of gas dose rates to generate a set of Langmuir isotherms. Results show that the initial gas dose forms Pu{sub 2}O{sub 3} on the Pu metal surface followed by the formation of PuO{sub 2} resulting in a layered oxide structure. This work represents the first steps in determining the activation energy for adsorption of various atmospheric gases on Pu.

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7 p. (0.3 MB)

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PDF-file: 7 pages; size: 0.3 Mbytes

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  • Presented at: 2012 MRS Spring Meeting, San Francisco, CA, United States, Apr 09 - Apr 13, 2012

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  • Report No.: LLNL-PROC-546433
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1047243
  • Archival Resource Key: ark:/67531/metadc827979

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Office of Scientific & Technical Information Technical Reports

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  • March 29, 2012

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • April 17, 2017, 12:58 p.m.

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Nelson, A J; Holliday, K S; Stanford, J A; Grant, W K; Erler, R G; Allen, P G et al. Adsorption of Atmospheric Gases on Pu Surfaces, article, March 29, 2012; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc827979/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.