![kll xps peak kll xps peak](https://www.researchgate.net/profile/Matthew-Linford/publication/265209129/figure/fig8/AS:392232210321425@1470526854172/XPS-survey-spectra-left-narrow-scans-middle-and-VB-spectra-right-of-a-silicon.png)
![kll xps peak kll xps peak](https://www.jp.xpssimplified.com/_images/element-carbon-polymers-experimental.png)
The oxide carbide has a spectroscopically determined composition of PuO/sub 0.65+-0.15/C/sub 0.45+-0.15/ and reacts with CO, CO/sub 2/, and O/sub 2/ at low pressures to form PuO/sub 2/ and unbound carbon in a coherent product layer (approx. The reaction conditions duplicate those at which plutonium monoxide reportedly forms and demonstrate that the NaCl-type surface phase more » previously identified as PuO is actually PuO/sub x/C/sub y/. Formation of the oxide carbide is evidenced by the fact that a shift in the Pu(4f/sub 7/2/) binding energy is coincident with changes in the C(1s) photoelectron and C(KLL) Auger spectra, showing that unbound carbon is converted to carbide. cap alpha.-Pu/sub 2/O/sub 3/, and PuO/sub x/C/sub y/, are successively formed when oxide-coated plutonium metal is heated in vacuo to 500/sup 0/C. The plutonium-oxygen phase diagrams has been clarified by XPS and AES results which show that three oxygen-containing plutonium phases, PuO/sub 2/. The XPS and AES data show that at higher reaction temperatures (400 to 500/sup 0/C) the surface compound formed is not PuO as indicated by Terada et al., but is instead a plutonium oxycarbide (Pu(C,O)) compound. These results were compared with the x-ray diffraction data of Terada et al. The reactions occurring were examined by monitoring the binding energies of the Pu(4f/sub 7/2/), O(1s), and C(1s) XPS peaks and observing the C(KLL) Auger electron peak structure. When plutonium metal with a surface oxide film is vacuum heat treated, the oxide is reduced by reaction of the substrate metal with the oxide. The effect of heating (150 to 500/sup 0/C) in vacuum a plutonium substrate with a plutonium oxide surface film was studied utilizing X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES).