Thermal Energy Ion-Neutral Reactions Relevant to the Interstellar Medium and Planetary Ionospheres

Details Thermal Energy Ion-Neutral Reactions Relevant to the Interstellar Medium and Planetary Ionospheres Thermal Energy Ion-Neutral Reactions Relevant to the Interstellar Medium and Planetary Ionospheres

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..gec.m3b02a&link_type=abstract

American Physical Society, Gaseous Electronics Conference, October 21-24, 1996, abstract #M3B.02

Physics

Scientific paper

Ion-molecule and ion-atom reactions are important in many ionized media. They are implicated in the molecular formation that occurs in the extensive interstellar gas clouds that pervade galaxies and in which star formation is occurring. These clouds contain molecular species, ranging from H2 to HC_11N, of which over 100 have been identified, 10% being ions. Ion-molecule reactions are also central to understanding the structure of planetary ionospheres and provide a means of detecting toxic trace impurities in the lower atmosphere of the Earth. The types of ion-neutral reactions important in these media will be discussed. These vary from conventional binary reactions, such as proton transfer and ligand switching, to association reactions and reactions with atomic hydrogen. Examples will be taken from recent experimental work in our laboratories using flow tube techniques. In these experiments, structures of ions are also being probed by their reactivity. The importance of this is becoming more evident as different isomeric forms are revealed. The final step of electron-ion recombination by which many of the ions in plasmas are neutralized will also be briefly mentioned.

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