PHOTOELECTRON SPECTROSCOPY OF HIGHLY RADIOACTIVE MATERIALS
An electron spectrometer for XPS, AES and in particular for high resolution UPS on highly radioactive materials is described. A commercial spectrometer was modified to work under glovebox conditions. The performance of the spectrometer is described. Particular emphasis is given to the high resolution achieved for UPS. UPS/XPS valence band spectra of UO-2, NpO-2, PuO-2, Pu-2O-3 and Am-2O-3 are presented. XPS 4f core level spectra of actinide dioxides and sesqui-oxides are compared. UPS/XPS valence band spectra for Np alpha-Pu and Am are presented. He II excited valence band spectra for the alpha->delta phase transition in Pu metal are shown. The general difficulty of separating density of state from correlation induced structures is discussed. The 2.3 eV valence band "satellite" found for U metal and attributed to a beginning of a localization of the 5f electrons is discussed. XPS 4f core level spectra of Np, Pu and Am also show the transition to localized 5f behaviour in Am. Finally some photoemission investigations on actinide intermetallics are given. UPS valence band spectra of PuFe-2 indicate a localization of 5f electrons. Resonant photoemission spectra of UAl-2 and UMn-2 demonstrate how different orbital contributions to the conduction band can be distinguished.
Bibliographic Reference: INTERNATIONAL WORKSHOP ON "PERSPECTIVES ON THE USE OF SYNCHROTRON RADIATION IN TRANSURANIUM RESEARCH", KARLSRUHE (GERMANY) NOV. 17-19, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32561 ORA
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Record Number: 1989124121400 / Last updated on: 1987-01-01
Available languages: en