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The change of the definition of the kilogram has been proposed. The new definition will be based on the Planck constant. After the change, the National Metrology Institute of Japan (NMIJ) will realize the kilogram by using the x-ray crystal density method with a 28Si-enriched sphere. A pilot study to confirm the international equivalence of the ability to realize the kilogram from the new definition...
Surface layer characterization is crucial for high-accuracy determination of the Avogadro constant by using 28Si enriched spheres for redefinition of the kilogram. In this work, we carried out the thickness measurements of the oxide and carbonaceous layer on a 28Si-enriched sphere by x-ray photoelectron spectroscopy (XPS) for a pilot study to confirm the international equivalence of the ability to...
To reduce the uncertainty of the Avogadro constant for the new definition of the kilogram, the surface analysis of the Si sphere produced for the accurate determination of the Avogadro constant is indispensable. In this work, we conducted the surface quantitative analysis to find out the metallic contaminations of a Si sphere by x-ray fluorescence (XRF) spectroscopy. The x-ray photoelectron spectroscopy...
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