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Towards an improved determination of the Avogadro constant.

Brown, R J C; Milton, M J T (2003) Towards an improved determination of the Avogadro constant. NPL Report. COAM 17

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The Avogadro constant ( NA ) is the fundamental constant that relates quantities at the atomic scale to those at the macroscopic scale. It is currently of particular interest because an experimental determination of the Avogadro constant is one of several possible ways to re-define the kilogram ultimately leading to a replacement of the prototype kilogram at BIPM. In order to do this NA must be determined with a relative uncertainty of 1 part in 10 8 . This report presents an introduction to the measurement of NA , a review of the XRCD technique currently used for its determination and some of the difficulties associated with it. The report goes on to propose some alternative experimental methods based on ion accumulation exploiting new technologies and novel mass artefacts, and comments on how each may contribute to improved determinations of the Avogadro constant. They deserve further investigation as technologies improve.

Item Type: Report/Guide (NPL Report)
NPL Report No.: COAM 17
Subjects: Analytical Science > Trace Analysis and Electrochemistry
Last Modified: 20 Jul 2018 14:34
URI: http://eprintspublications.npl.co.uk/id/eprint/2561

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