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The application of highly surface sensitive electron spectroscopic methods to the determination of electronic structures and of the chemical composition of highly alpha-active solids is described. Selected results from photoelectron spectroscopy on the UMn(2) and on actinide metals from Th to Am demonstrate the identification of the quantum character of valence electrons and the transformation of bandlike 5f electrons for alpha-Pu into localised 5f electrons for Am. For more applied purposes the high surface sensitivity of photelectron spectroscopy was used to characterise surfaces during oxidation and gas adsorption. Characteristic examples are: (1) the oxidation of Np metal, for which it is shown that a boundary layer between the bulk Np metal and the final covering dioxide surface layer is composed of Np(2)O(3), a phase that does not exist as bulk material; (2) the interaction of CO with the surface of clean U metal and UNi(5). The perspectives of combining basic research on electronic properties, chemical bonding etc. and characteristic surface studies in the field of actinides are described.

Additional information

Authors: NAEGELE J R, JRC Karlsruhe, Institute for Transuranium Elements, Postfach 2340, D-7500 Karlsruhe (DE)
Bibliographic Reference: Paper presented: Transuranium Elements Today and Tomorrow, Karlsruhe (DE), Oct. 26-27, 1988 Article: Journal of Nuclear Materials, No. 166 (1989), pp. 59-67
Availability: Available from (1) as Paper EN 34558 ORA
Record Number: 198911067 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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