Silicon ion chemistry in the ionosphere

Details Silicon ion chemistry in the ionosphere Silicon ion chemistry in the ionosphere

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29..307f&link_type=abstract

Planetary and Space Science, Volume 29, Issue 3, p. 307-312.

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22

Scientific paper

Loss processes which remove Si+ ions selectively relative to other meteor-derived atomic ions in the E- and D-regions of the ionosphere have been identified and measured in the laboratory. The major Si+ loss in the E-region is the reaction Si+ + H2O --> HSiO+ + H (1) with a rate constant 2.3 +/- 0.9 × 10-10 cm3s-1 at 300 K. The corresponding reactions with Fe+, Mg+ and other metallic meteor ions are endothermic. Presumably (1) is followed by a fast dissociative-recombination with electrons to produce neutral SiO or Si. At lower altitudes Si+ ions associate in a three-body reaction with O2 with a much larger rate constant than the corresponding associations of Fe+ and Mg+ with O2.

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