New Silicon Crystals For A Redefined Kilogram And Mole: Isotopic Composition Of The First Two Crystals
2018 CONFERENCE ON PRECISION ELECTROMAGNETIC MEASUREMENTS (CPEM 2018)(2018)
Abstract
The isotopic compositions (molar mass, M) of the first and new silicon crystals highly enriched in Si-28 (> 99.99 %) used for the determination of the Avogadro constant were measured using a high resolution multicollector ICP mass spectrometer and applying a modified isotope dilution mass spectrometry technique. Relative uncertainties u(rel)(M) < 1 x 10(-9) were obtained: a reduction by almost three orders of magnitude in ten years. This study compares the homogeneities in M(Si) of the first "AVO28" crystal and the first crystal (Si28-23Pr11) of the "Kilogram-2" project.
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Key words
Avogadro constant, enriched silicon, homogeneity, isotopic composition, "Kilogram-2" project, mass spectrometry
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