Atmospheric chemistry of iodine anions: elementary reactions of I−, IO−, and IO2− with ozone studied in the gas-phase at 300 K using an ion trap. Issue 45 (8th November 2018) - Teiwes, Ricky
Abstract : Using a radio-frequency ion trap to study ion–molecule reactions under isolated conditions, we report a direct experimental determination of reaction rate constants for the sequential oxidation of iodine anions by ozone at room temperature (300 K). Abstract : Using a radio-frequency ion trap to study ion–molecule reactions under isolated conditions, we report a direct experimental determination of reaction rate constants for the sequential oxidation of iodine anions by ozone at room temperature (300 K). The results are R1: I − + O3 → IO − + O2, k 1 = (7 ± 2) × 10 −12 cm 3 s −1 ; R2: IO − + O3 → IO2 − + O2, k 2 = (10 ± 2) × 10 −9 cm 3 s −1 ; R3: IO2 − + O3 → IO3 − + O2, k 3 = (16 ± 2) × 10 −9 cm 3 s −1 . More oxidized forms such as IO4 − and IO5 − were not observed. Additionally, we performed quantum chemical calculations to elucidate the energetics of these oxidation reactions.