Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..855..272p&link_type=abstract
ASTROCHEMISTRY: From Laboratory Studies to Astronomical Observations. AIP Conference Proceedings, Volume 855, pp. 272-280 (2006
Astronomy and Astrophysics
Astronomy
2
Ion Chemistry Of The Atmosphere, Meteors, Meteorites And Tektites
Scientific paper
Metal ions are a significant product of meteoric ablation within planetary atmospheres. The lifetimes and ultimate chemical processing of these metal ions depend crucially on their association chemistry with the dominant atmospheric constituents (variously N2, CO2, and H2 among the Solar System's representative planetary atmospheres), yet this association chemistry has received very little previous study. In this work we present, for the first time, calculated temperature-dependent termolecular association rate coefficients for the reactions of the dominant main-group metal ions Na+, Mg+, Al+, K+, and Ca+ with N2, CO2, and H2. These rate coefficients have been determined through the use of variational transition state theory, employing structural and thermochemical data obtained via ab initio quantum chemical calculations. Implications of the calculated kinetic data, for a few specific instances of meteoric metal-ion chemistry, are sketched out, and directions for future study are also outlined.
Dunbar Robert C.
Petrie Simon
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