Determination of the Avogadro Constant
- 19 August 1974
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 33 (8), 463-466
- https://doi.org/10.1103/physrevlett.33.463
Abstract
Measurements are reported on the densities and isotopic-abundance ratios of nearly perfect Si single crystals. These, when combined with optical interferometry of the crystal repeat distance, yield a new value for the Avogadro constant. This result, (1.05 ppm), represents a more than thirty-fold reduction in the uncertainty of previous direct measurements.
Keywords
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