Title: High Precision Measurement of the Avogadro Constant Based on Silicon
Abstract: This paper describes an attempt to replace the present definition of the kilogram with the mass of a certain number of carbon atoms. This requires determination of the Avogadro constant, NA, with a relative uncertainty of 1 × 10−8. Silicon crystals are used in this determination. At present, a limiting factor is the measurement of the average molar mass of natural Si. Consequently, a worldwide collaboration has been set up, to produce, approximately, 5 kg of 28Si single‐crystal with an enrichment greater than 99.985% and of sufficient chemical purity to be used for the determination of NA with a target relative measurement uncertainty better than 2 × 10−8.
Publication Year: 2005
Publication Date: 2005-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 1
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