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In 2011, the first determination of the Avogadro constant with Si material was published with an overall relative uncertainty of . The results were based on measurements of a very pure single crystal of highly enriched silicon-28. Where the result of crystal properties, molar mass, and lattice constant could be performed with satisfying uncertainty, the measurements on the spheres...
For the characterisation of a surface the spatial short wavelength cutoff of the measuring instrument is an important parameter that has to be known, especially when different techniques are to be compared. The definition of the transfer characteristic by a transmission bandwidth with λs and λc-limits as defined in the GPS-standards for surface contact stylus measurement is transferred here to the...
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