E Massa et al 2009 Metrologia 46 249 doi:10.1088/0026-1394/46/3/011
E Massa1, G Mana1 and U Kuetgens2
Show affiliationsTo base the kilogram definition on the atomic mass of the 28Si atom, the present relative uncertainty of the 28Si lattice parameter must be lowered to 3 × 10−9. A new experimental apparatus capable of a centimetre measurement-baseline has been used to remeasure the lattice parameter of crystals MO*4 of INRIM and WASO 4.2a of PTB. The comparison between these determinations is intended to verify the measurement capabilities and to assess the limits of this experiment.
06.20.fb Standards and calibration
Issue 3 (June 2009)
Received 2 December 2008, in final form 5 February 2009
Published 24 March 2009
E Massa et al 2009 Metrologia 46 249
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