| http://www.w3.org/ns/prov#value | - It is sensitive to essentially all elements except hydrogen and helium, with detection limits down to approximately 0.1 atomic %.XPS measurements were carried out on the sample materials using a Kratos Axis Ultra Spectrometer (Kratos Analytical, Manchester, England), which spectrometer was equipped with a monochromatic Al K??. x-ray excitation source and a spherical mirror analyzer.
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