Studies of calcium isotope fractionation found in nature and produced during ion sputtering

Details Studies of calcium isotope fractionation found in nature and produced during ion sputtering Studies of calcium isotope fractionation found in nature and produced during ion sputtering

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phdt.........3r&link_type=abstract

Ph.D. Thesis California Inst. of Tech., Pasadena.

Computer Science

Calcium Isotopes, Chemical Fractionation, Ion Sources, Sputtering, Abundance, Chemical Composition, Earth (Planet), Moon, Sampling, Solar System, Solar Wind

Scientific paper

High precision analytical techniques were developed for the measurement of calcium isotopic abundances in samples as small as 2 x10 to the -9th power mole. Typical relative uncertainties for measurement of calcium isotope abundance ratios are 1-4 x 10 to the -4th power and isotopic differences between samples arising from mass fractionation can be resolved to 1 x 10 to the -4th power per unit mass difference. Variation of Ca isotope compositions in the solar system were studied through analysis of meteorites, lunar samples, and terrestrial samples. Terrestrial, lunar, and meteoritic Ca isotopic fractionation ranges overlap and are about 2.50/00 for Ca-40/Ca-44. Measurements were carried out for Ca leached with water from a lunar soil. The sputtering experiments roughly simulate the solar wind conditions in terms of the beam energy per mass unit and in terms of the sputtering yields. The large effects indicate the likelihood that fractionation intrinsic to sputtering was a major mechanism contributing to the lunar soil isotopic fractionation.

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