Several ion–molecule reactions of ionospheric interest have been studied in a drift-tube–mass-spectrometer apparatus for ions of mean energy from thermal energies to ∼ 1 eV. The measured rate coefficients in cubic centimeters/second are N++O2: 5 × 10−10 from 0.039–0.9 eV; N2++O2: 6 × 10−11 at 0.039 eV, decreasing to ∼ 8 × 10−12 at 0.9 eV; O2++NO: 3 × 10−10 from 0.039–1.6 eV; O++CO2: 1 × 10−9 at 0.039 eV, decreasing to 5 × 10−10 cm3/sec at 1.3 eV. The relevance of the first three reactions for the Earth's ionosphere and of the last reaction for the Martian atmosphere is discussed briefly.
Ion–molecule reactions of sodium, potassium, and barium ions with O2, NO, and H2O have been studied in a drift tube–mass spectrometer apparatus. The following rate constants or upper limits were obtained: Na+,K, +, Ba++O2(NO)→products, k < 10−13cm3/sec (0.04 − ∼ 5 eV), Na++H2O+M→Na+·H2O+M, k(3) = 1.0(+ 0.5, − 0.3) × 10−28cm6/secfor M = H2O, k(3) = 4.7(+ 1.2, − 1.0) × 10−30cm6/secfor M = He, K++H2O+M→K+·H2O+M, k(3) = 4.5(+ 2.3, − 1.5) × 10−29cm6/secfor M = H2O, k(3) = 2.6(+ 0.7, − 0.5) × 10−30cm6/secfor M = He. The consequences of these results for the D and E region of the upper atmosphere are briefly described.
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