A Redetermination of the Relative Abundances of the Isotopes of Neon, Krypton, Rubidium, Xenon, and Mercury

A careful redetermination of isotopic abundance ratios in neon, krypton, rubidium, xenon, and mercury has been made. The mass spectrometer employed was calibrated for mass discriminative effects with a synthetic argon isotope mixture made from essentially pure samples of ${\mathrm{A}}^{36}$ and ${\mathrm{A}}^{40}$. The present results together with those obtained from an earlier study on carbon, nitrogen, oxygen, argon, and potassium enable one to use the several elements investigated as sub-standards for calibrating mass spectrometers for mass discriminative effects in other instances.