Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21423201a&link_type=abstract
American Astronomical Society, AAS Meeting #214, #232.01; Bulletin of the American Astronomical Society, Vol. 41, p.735
Other
Scientific paper
The two main astrophysical media where molecules exist are interstellar gas clouds and planetary ionospheres. Molecules play important roles in giving information about physical conditions within these media and how fast the media can cool, e.g., during gravitational collapse. For this information to be reliably interpreted requires an understanding of the molecular synthesis. This synthesis can proceed via (i) ion-molecule reactions, (ii) neutral radical reactions and (iii) reactions on surfaces (dust grains and aerosols, in interstellar gas clouds and planetary atmospheres respectively). This presentation will concentrate on (i). Following ionization by cosmic rays (in the interstellar medium), stellar winds and stellar irradiation (in planetary ionospheres), an ion chemistry can proceed, being controlled by the composition of the media, and indeed can contribute to the change of the composition of the media. In these environments, classes of reactions can occur, predominantly charge transfer, proton transfer, H-atom abstraction, dissociative electron attachment, associative detachment, association as well as some other more minor mechanisms. Ionization loss is by electron-ion dissociative and ion-ion recombination. These processes will be discussed and illustrated with examples from interstellar gas clouds and the Titan ionosphere. The measurements are made using Selected Ion Flow Tubes (for the ion-molecule reactions) and Flowing Afterglows and Storage Rings for recombination. These techniques that are used to obtain the kinetic data will be described. Funding by NASA is gratefully acknowledged.
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