Determination of the atomic weight of ²⁸Si-enriched silicon for a revised estimate of the Avogadro Constant

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DOIResolve DOI: http://doi.org/10.1021/ac203006j
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TypeArticle
Journal titleAnalytical Chemistry
ISSN0003-2700
1520-6882
Volume84
Issue5
Pages23212327; # of pages: 7
AbstractThe much anticipated overhaul of the International System of Units (SI) will result in new definitions of base units in terms of fundamental constants. However, redefinition of the kilogram in terms of the Planck constant (h) cannot proceed without consistency between the Avogadro and Planck constants, which are both related through the Rydberg constant. In this work, an independent assessment of the atomic weight of silicon in a highly enriched ²⁸Si crystal supplied by the International Avogadro Coordination (IAC) was performed. This recent analytical approach, based on dissolution with NaOH and its isotopic characterization by multicollector inductively coupled plasma mass spectrometry, is critically evaluated. The resultant atomic weight Ar(Si) = 27.976 968 39(24)k=1 differs significantly from the most recent value of Ar(Si) = 27.976 970 27(23)k=1. Using the results generated herein for Ar(Si) along with other IAC measurement results for mass, volume, and the lattice spacing, the estimate of the Avogadro constant becomes NA = 6.022 140 40(19) × 10²³ mol⁻¹.
Publication date
LanguageEnglish
AffiliationNRC Institute for National Measurement Standards; National Research Council Canada
Peer reviewedYes
NPARC number21268853
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Record identifier6cb46257-105f-484c-862a-b13cfae80f33
Record created2013-11-15
Record modified2016-05-09
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