Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5512h&link_type=abstract
American Astronomical Society, DPS meeting #39, #55.12; Bulletin of the American Astronomical Society, Vol. 39, p.528
Astronomy and Astrophysics
Astronomy
Scientific paper
Molecular hydrogen is the dominant chemical species in the atmospheres of the giant planets. Because of their low masses, neutral and ionized hydrogen atoms are the dominant species in the high atmospheres of many planets. Finally, protons are the principal heavy component of the solar wind.
Here we present a critical evaluation of the current state of understanding of the chemical reaction rates and collision cross sections for several important collision processes in planetary atmospheres, ionospheres, and magnetospheres. These processes are grouped as follows:
(a) charge transfer in collisions of H+ with H,
(b) H+ + H2(v) ion-molecule reactions, and
(c) H2(v,J) + H2 vibrational, rotational, and ortho-para relaxation.
Of particular importance are the conclusions that H2 ortho-para conversion is at least an order-of-magnitude faster than previously assumed and that H+ + H2(v) is more likely to result in vibrational relaxation than charge transfer.
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