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Absolute Isotopic Abundance Ratios and the Atomic Weight of a Reference Sample of Chromium

Overview
Journal J Res Natl Bur Stand A Phys Chem
Specialty Chemistry
Date 2019 Dec 12
PMID 31823989
Citations 22
Authors
William R Shields
Thomas J Murphy
Edward J Catanzaro
Ernest L Garner
Affiliations
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Abstract

Absolute values have been obtained for the isotopic abundance ratios of a reference sample of chromium, using surface emission mass spectrometry. Samples of known isotopic composition, prepared from nearly pure separated chromium isotopes, were used to calibrate the mass spectrometers. The resulting absolute values are Cr/Cr = 0.051859 ±0.000100, Cr/Cr = 0.113386 ±0.000145, Cr/Cr = 0.028222 ±0.000059, yielding an atomic weight (C=12) of 51.99612 ±0.00033. The indicated uncertainties arc overall limits of error based on 95 percent confidence limits for the mean and allowances for effects of known sources of possible systematic error.

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References
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Shields W, Murphy T, Garner E . Absolute Isotopic Abundance Ratio and the Atomic Weight of a Reference Sample of Copper. J Res Natl Bur Stand A Phys Chem. 2019; 68A(6):589-592. PMC: 6592378. DOI: 10.6028/jres.068A.056. View
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Catanzaro E, Murphy T, Garner E, Shields W . Absolute Isotopic Abundance Ratio and the Atomic Weight of Bromine. J Res Natl Bur Stand A Phys Chem. 2019; 68A(6):593-599. PMC: 6592381. DOI: 10.6028/jres.068A.057. View