The IMGC volume-density standards for the Avogadro constant

The IMGC volume-density standards for the Avogadro constant

Volume-density standards in the form of single-crystal silicon spheres have been introduced and developed at the IMGC. A new sphere of nearly perfect form has been characterized on the basis of a comprehensive set of interferometric, roundness, mass and hydrostatic measurements. From its mass and vo...

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Veröffentlicht in:IEEE transactions on instrumentation and measurement 1995-04, Vol.44 (2), p.533-537
Hauptverfasser: Sacconi, A., Peuto, A.M., Mosca, M., Panciera, R., Pasin, W., Pettorruso, S.
Format: Artikel
Sprache:eng
Schlagworte:
Atomic measurements
Density measurement
Determination of fundamental constants
Exact sciences and technology
Impurities
Metrology
Metrology, measurements and laboratory procedures
Optical interferometry
Physics
Position measurement
Silicon
Standards development
Volume measurement
Wavelength measurement
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Beschreibung
Zusammenfassung:Volume-density standards in the form of single-crystal silicon spheres have been introduced and developed at the IMGC. A new sphere of nearly perfect form has been characterized on the basis of a comprehensive set of interferometric, roundness, mass and hydrostatic measurements. From its mass and volume and from the evaluation of the oxide layer and of impurities, a density of (2.32908350/spl plusmn/0.00000036) g/cm/sup 3/ has been assigned to a near-perfect silicon crystal. In comparison to the measurements based on a previous sphere, the relative combined uncertainty has been reduced from 4.1/spl times/10/sup -7/ to 1.5/spl times/10/sup -7/.< >
ISSN:0018-9456
1557-9662
DOI:10.1109/19.377900