The Effect of Argon Ion Sputtering on Uranium Hydride Initiation Time




Abstract: The length of time needed before hydriding is initiated on a uranium surface is often postulated to be determined by the thickness of its oxide layer. Here we used the introduction chamber of a X-ray photoelectron spectrometer (XPS) to initiate hydriding on a electropolished sample of 2.5 cm diameter after sputtering a 25 mm2 area in the XPS and transferring it back into the introduction chamber under ultra-high vacuum conditions. Contrary to expectations and a recent publication, hydriding occurred first in the un-sputtered area, and only very much later in the sputtered area.

Authors: W.J. Siekhaus and A.J. Nelson

Keywords: Uranium Hydride, Sputtering, XPS

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4 pages


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