| Autor: |
Pedersen, Henrik B., Elm, Jonas, Frederiksen, Christian H., Jessen, Simon P. S., Teiwes, Ricky, Bilde, Merete |
| Zdroj: |
Physical Chemistry Chemical Physics (PCCP); 9/14/2020, Vol. 22 Issue 34, p19080-19088, 9p |
| Abstrakt: |
We report an investigation of the reaction of isotope-substituted hydrated iodide I(H 182 O)− with ozone 16O3 to examine the involvement of the water molecules in the oxidation reactions that terminate with the formation of IO3−. Experimentally, we studied the reaction in the gas phase as elementary reactions using a radio-frequency (RF) ion-trap combined with a quadrupole mass spectrometer (QMS). In approximately 1.2% of the reactions of I(H 182 O)− and 16O3, the 18O atom is found to appear in iodine oxide anions, thus giving evidence for a close involvement of the water molecule in a non-negligible number of the reactions towards IO3−. As a part of the experimental investigation, the reaction rate constant for the exchange reaction I(H 182 O)− + H 162 O → I(H 162 O)− + H 182 O at 300 K was found to be (1.3 ± 0.1) × 10−8 cm3 s−1. Quantum chemical calculations are exploited to establish the energetic difference between I(H 182 O)− and I(H 162 O)−. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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