On the role of electron-driven processes in planetary atmospheres and comets

Details On the role of electron-driven processes in planetary atmospheres and comets On the role of electron-driven processes in planetary atmospheres and comets

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phys...80e8101c&link_type=abstract

Physica Scripta, Volume 80, Issue 5, pp. 058101 (2009).

Physics

1

Scientific paper

After the presence of ionized layers in the Earth's atmosphere was inferred, it took 50 years to quantitatively understand them. The electron density could not be accounted for until Sir David Bates first suggested (along with Sir Harrie Massey) that the main electron-loss process was dissociative recombination with molecular ions, and he and colleagues then developed a theory to predict those rates of dissociative recombination. However, electron impact processes, particularly excitation, have been considered insignificant in most situations, in both planetary and cometary atmospheres. Here we describe cases where recent calculations have shown that electron impact excitation of molecules is important, suggesting that, just as in the time of Sir David Bates, electron-driven processes remain fundamental to our quantitative understanding of atmospheric and cometary phenomena.

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