Comparison of the INRIM and PTB lattice-spacing standards
arXiv:0902.0379 · doi:10.1088/0026-1394/46/3/011
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.
10 pages, 8 figures, submitted to Metrologia