PES_An-O-Films-ice

<p>The interaction of thin films of different actinide oxides with adsorbed water ice was studied by ultraviolet and X-ray photoelectron spectroscopy (UPS and XPS, respectively).&nbsp;<br> The studies address radiation enhanced reactions, occurring at the actinide oxide surfaces in contact with an aqueous phase under UV-irradiation. This reaction was observed for PuO₂ in 2010 and then extended to other actinide oxide surfaces (NpO₂, UO₃, UPuO₂, UThO₂). The thin films were produced by reactive sputter deposition from metal targets in an Ar/O₂ plasma. Water was condensed as a thick ice overlayer on the surface at low temperature. Subsequent warming led to desorption of the ice and a reduction of the uppermost surface under irradiation by UV-light (from HeI and HeII radiation used for UPS). The observed surface reduction for the materials was tentatively explained as a photoactivated reaction of the surface with the surrounding water phase.</p> <p>This collection comprises of these datasets:<br> &ndash; UPuO₂ reduction with water ice&nbsp; (Ice on U-Pu Oxide Films)<br> &ndash; NpO₂ reduction with water ice (Ice on Np Oxide Films)<br> &ndash; UO₃ reduction with water ice&nbsp; (Ice on UO₂ and UO₃ Oxide Films)<br> &ndash; UThO₂ reduction with water ice (Ice on U-Th Oxide Films)<br> In each dataset, you will find a Lab Book together with the spectra data stored in the VAMAS format. This is a universal form used by many commercial data analysis programs such as CasaXPS. Description of the VAMAS format can be found in the internet. See e.g. <a href="https://github.com/Yohko/importtool/blob/master/Igor%20Procedures/import%20tool/import_VAMAS.ipf">https://github.com/Yohko/importtool/blob/master/Igor%20Procedures/import%20tool/import_VAMAS.ipf</a>&nbsp;</p> <p>Part of the data sets was used for the following publications:<br> P. Cakir, R. Eloirdi, F. Huber, R.J.M. Konings, T. Gouder, Surface reduction of neptunium dioxide and uranium mixed oxides with plutonium and thorium by photocatalytic reaction with ice, Journal of Physical Chemistry C, 119 (2015) 1330-1337.</p> <p>T. Gouder, A.B. Shick, F. Huber, Surface interaction of PuO2, UO2+x and UO3 with water ice, Topics in Catalysis, 56 (2013) 1112-1120.</p>