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IOP Publishing, Metrologia, 3(46), p. 249-253, 2009

DOI: 10.1088/0026-1394/46/3/011

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Comparison of the INRIM and PTB lattice-spacing standards

Journal article published in 2009 by E. Massa, G. Mana ORCID, U. Kuetgens
This paper is available in a repository.
This paper is available in a repository.

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Abstract

To base the kilogram definition on the atomic mass of the silicon 28 atom, the present relative uncertainty of the silicon 28 lattice parameter must lowered to 3E-9. To achieve this goal, a new experimental apparatus capable of a centimetre measurement-baseline has been made at the INRIM. The comparison between the determinations of the lattice parameter of crystals MO*4 of INRIM and WASO4.2a of PTB is intended to verify the measurement capabilities and to assess the limits of this experiment. ; Comment: 10 pages, 8 figures, submitted to Metrologia