Articlegreen2012

Determination of the Atomic Weight of 28Si-Enriched Silicon for a Revised Estimate of the Avogadro Constant

Lu Yang · Zoltán Mester · Ralph Edward Sturgeon · Juris Meija

48 citations0/0 files storedAnalytical Chemistry

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Scientific Measurement and Uncertainty Evaluation Analytical chemistry methods development Advanced Frequency and Time Standards

Abstract

The 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 (28)Si 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 A(r)(Si) = 27.976 968 39(24)(k=1) differs significantly from the most recent value of A(r)(Si) = 27.976 970 27(23)(k=1). Using the results generated herein for A(r)(Si) along with other IAC measurement results for mass, volume, and the lattice spacing, the estimate of the Avogadro constant becomes N(A) = 6.022 140 40(19) × 10(23) mol(-1).

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References

2003Atomic weights of the elements. Review 2000 (IUPAC Technical Report)2008CODATA recommended values of the fundamental physical constants: 2006 2006Redefinition of the kilogram, ampere, kelvin and mole: a proposed approach to implementing CIPM recommendation 1 (CI-2005)2011Determination of the Avogadro Constant by Counting the Atoms in a Si28 Crystal 2003Determination of the Avogadro constant via the silicon route 2001History and progress in the accurate determination of the Avogadro constant 2006Large-scale production of highly enriched28Si for the precise determination of the Avogadro constant 2005Present State of the Avogadro Constant Determination From Silicon Crystals With Natural Isotopic Compositions

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2014Absolute silicon molar mass measurements, the Avogadro constant and the redefinition of the kilogram 2014Molar-mass measurement of a28Si-enriched silicon crystal for determination of the Avogadro constant 2019High-Precision Measurements of the Isotopic Composition of Common Lead Using MC-ICPMS: Comparison of Calibration Strategies Based on Full Gravimetric Isotope Mixture and Regression Models 2015Probing the homogeneity of the isotopic composition and molar mass of the ‘Avogadro’-crystal

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