Abstract

For a precision determination of Avogadro's constant, N/sub A/, the volume of a nearly perfect silicon sphere of 1 kg and about 90 mm diameter, made of a single-crystal, is to be measured with a relative uncertainty of 10/sup -7/. For this, a new interferometric method is used to measure the diameter and its variations in large number of orientations with uncertainties in the sub-nm range.

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