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The first detailed studies of the adsorption of O(2), CO(2), CO and C(2)H(4) on Pu metal at 77 and 296 K are reported. The UV and X-ray photoemission spectroscopy (UPS, XPS) results are compared with previous measurements of the same gases on U. The degree of 5f delocalisation decreases along the actinide series until Pu, so that the electronic and surface properties of Pu are of particular interest. Comparing the gas adsorption results for Pu and U metal, some common reactivity properties were observed. However a wider variety of reaction products were formed by these gases on Pu. Oxygen adsorption showed the formation of two oxides on Pu metal, Pu(2)O(3) and PuO(2). In carbon dioxide adsorption at 77 K, after the dissociation of the gas, Pu forms carbonates, followed by physisorption of CO(2), while in carbon monoxide chemisorption of CO occurs. These differences between the adsorption behaviour of the two metals are discussed in terms of their electronic structure.

Additional information

Authors: ALMEIDA T, JRC Karlsruhe (DE);NAEGELE J R, JRC Karlsruhe (DE);COX L E, Los Alamos National Laboratory, Materials Science and Technology Division (US);WARD J W, Los Alamos National Laboratory, Materials Science and Technology Division (US)
Bibliographic Reference: Paper presented: 23. Journées des Actinides, Bühlerhöhe (DE), April 20-23, 1993
Availability: Text not available
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