Article1997

Measuring the molar mass of silicon for a better Avogadro constant: reduced uncertainty

Roberto Gonfiantini · Paul De Bièvre · Staf Valkiers · Philip Taylor

46 citations0/0 files storedIEEE Transactions on Instrumentation and Measurement

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Scientific Measurement and Uncertainty Evaluation Radioactive Decay and Measurement Techniques Advanced Frequency and Time Standards

Abstract

The current 3/spl times/10/sup -5/ relative combined uncertainty the isotope amount ratio measurements in natural Si must be improved in order to obtain a relative combined uncertainty on the molar mass smaller than 1/spl times/10/sup -7/. One of the problems is the isotopic effect, which accompanies adsorption/desorption processes of SiF/sub 4/ in the mass spectrometer inlet system. The value of M(Si) observed in 1994/95 was confirmed in this work to within 10/sup -7/M(Si), which means that the adsorption/desorption models developed are (quantitatively) correct to describe and predict isotopic effects due to memory at uncertainty levels of /spl les/1/spl times/10/sup -5/ R and /spl les/1/spl times/10/sup -7/ M(Si). It also shows that the previously measured isotope amount ratio values and derived molar masses have a lower uncertainty. The results obtained by using models compare well with those obtained after chemical cleaning of the mass spectrometer inlet system and reduce the relative combined uncertainty from 3/spl times/10/sup -7/ M(Si) to 1.3/spl times/10/sup -7/ M(Si). The new M(Si) for the "Avogadro Crystal" WASO 17.2 is 28.085 384 2 (35) g/spl middot/moi/sup -1/ as compared to 28.085 383 1 (89) g mol/sup -1/ previously obtained. The new value of the Avogadro constant is 6.022 136 7 (48)/spl times/10/sup 23/ mol/sup -1/ as compared to 6.022 136 5 (51)/spl times/10/sup 23/ mol/sup -1/ previously obtained.

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References

1992A determination of the Avogadro Constant 1995The chemical preparation and characterization of specimens for "absolute" measurements of the molar mass of an element, exemplified by silicon, for redeterminations of the Avogadro constant

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