Abstract

An absolute value hsas been obtained for the isotopic abundance ratio of terrestrial rubidium, using solid-sample thermal ionization mass spectrometry. Samples of known isotopic composition, prepared from nearly isotopically pure separated rubidium isotopes, were used to calibrate the mass spectrometers. The resulting absolute <sup>85</sup>Rb/<sup>87</sup>Rb ratio is 2.59265 ± 0.00170 which yields atom percents of: <sup>85</sup>Rb = 72.1654 ± 0.0132 and <sup>87</sup>Rb = 27.8346 ± 0.0132. The atomic weight calculated from this isotopic composition is 85.46776 ± 0.00026. The indicated uncertainties are overall limits of error based on 95 percent confidence limits for the mean and allowances for the effects of known sources of possible systematic error.

Keywords

RubidiumNatural abundanceAtomic massIsotopeAbundance (ecology)Mass spectrometryChemistryAnalytical Chemistry (journal)IonizationAtom (system on chip)Atomic physicsPhysicsEnvironmental chemistryIonNuclear physics

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Publication Info

Year
1969
Type
article
Volume
73A
Issue
5
Pages
511-511
Citations
85
Access
Closed

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E.J. Catanzaro, Thomas J. Murphy, E Garner et al. (1969). Absolute isotopic abundance ratio and atomic weight of terrestrial rubidium. Journal of Research of the National Bureau of Standards Section A Physics and Chemistry , 73A (5) , 511-511. https://doi.org/10.6028/jres.073a.041

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DOI
10.6028/jres.073a.041