Mesospheric implications for the reaction of Si+ with O2(a1Δg)

Details Mesospheric implications for the reaction of Si+ with O2(a1Δg) Mesospheric implications for the reaction of Si+ with O2(a1Δg)

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3720801e&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 20, CiteID L20801

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Atmospheric Composition And Structure: Ion Chemistry Of The Atmosphere (2419, 2427), Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Thermosphere: Composition And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry

Scientific paper

The rate constant for the reaction of Si+ with O2(a 1Δg) was measured in a selected ion flow tube (SIFT) between 200 and 500 K. The temperature dependence is T-(2.2±0.8). The rate constant at 500 K is below the detection limit (<1 × 10-11 cm3 molecule-1 s-1) while the rate constant at 200 K is 3.6 × 10-11 cm3 molecule-1 s-1. The product is SiO+, in accord with potential energy surfaces. These surfaces also show that the reaction of Si+ with O2(3Σg-) only yields association products, SiOO+ or OSiO+ ions. An upper mesosphere/lower thermosphere model predicts that reaction with O2(a 1Δg) is the most important removal process for Si+ during the day between 87 and 107 km, which may explain the depletion of this ion relative to other ions of meteoric origin, such as Fe+ and Mg+. The reaction therefore has an important influence on the composition and lifetimes of sporadic E layers during daytime.

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