Silicon ion chemistry in the ionosphere |
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Authors: | EE Ferguson DW Fahey FC Fehsenfeld DL Albritton |
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Institution: | Max Planck Institut für Kernphysik, Heidelberg, P.O. Box 103980, Federal Republic of Germany;Aeronomy Laboratory, NOAA Environmental Research Laboratories, Boulder, CO 80303, U.S.A. |
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Abstract: | 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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