Noble gases from the interstellar medium trapped on the MIR space station and analyzed by in vacuo etching

Busemann, H.; Bühler, F.; Agafonov, Y. N.; Baur, H.; Bochsler, P.; Eismont, N. A.; Heber, V. S.; Wieler, R. and Zastenker, G. N. (2004). Noble gases from the interstellar medium trapped on the MIR space station and analyzed by in vacuo etching. In: 67th Annual Meeting of the Meteoritical Society, 4-6 Aug 2004, Rio de Janeiro, Brazil.

URL: http://www.lpi.usra.edu/meetings/metsoc2004/pdf/51...

Abstract

Introduction: The composition of the present interstellar medium (ISM) provides an important benchmark in cosmochemistry. It serves as a reference for galactic chemical evolution (GCE) models, solar mixing predictions and provides information for understanding Big Bang nucleosynthesis. The present-day ISM 3He abundance allows, combined with the protosolar 3He, deduced from the Jovian atmosphere or meteorites [1,2], tracing the GCE over the past 4.56 Ga. 3He/4He = (2.5 0.6) x 10-4 has been determined for the local ISM [3]. However, the uncertainty is too large to better constrain GCE models and - in combination with the present-day solar wind value - the protosolar D/H [4].

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