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This is a combined experimental and theoretical study of the compound UO2, UO2(NO3)2(H20)6 and UO0.75Pu0.25O2, using resonant inelastic x-ray scattering (RXIS), high resolution x-ray absorption (XAS) and LDA and LDA-U calculations.

After the CMMD Seminar by Sung Woo Yu on the subject of the x-ray spectroscopy of UO2, there arose some questions concerning the XAS of UO2. These questions can be distilled down to these three issues: (1) The validity of the data; (2) The monchromator energy calibration; and (3) The validity of XAS component of the figure shown. The following will be shown: (1) The data is valid; (2) It is possible to calibrate the monchromator; and (3) The XAS component of the above picture is correct. The remainder of this document is in three sections, corresponding to these three issues.

We have performed an extensive angle‐resolved photoelectron spectroscopy investigation of the surface‐alloying phenomena in the system Au/Cu(001), utilizing resonance lamp emission and synchrotron radiation. The alloy surface state, near M in the Cu(001) surface Brillouin zone, and the Au 4 f core levels exhibit significant binding‐energy shifts as a function of adsorbate coverage and substrate temperature. These and other changes are indicative of the formation and subsequent elimination of the surface‐alloy structure. Our new results will allow the consolidation of a vast body of previous results, including low‐energy electron diffraction, Auger electron spectroscopy, and photoemission measurements of Au/Cu(001), bulk Cu1−x Aux alloys, Cu3 Au(001), and Au(111).