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Day 3, June 24（Tue.）　

Room P (Maesato East, Foyer, Ocean Wing)

• 3P-PM-51（4A-O1-1225）
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Acceleration of Iodide Oxidation by Ozone in Atmospheric Clusters

(¹Queensland Univ. Tech., ²Univ. Melbourne, ³Univ. Wollongong)
^oSamuel Brydon¹, Evan Bieske², Adam Trevitt³, Stephen Blanksby¹

Growing evidence from both laboratory and field studies has indicated that iodide plays a crucial role in the ozone budget and other halogen mediated geochemical cycles. Here, the ion-molecule reactions of ozone with iodide clusters are examined using linear ion-trap mass spectrometry. Monohydrated iodide was generated by electrospray ionization (ESI) of m-iodobenzoic acid followed by collision-induced dissociation, whilst salt clusters were produced by ESI of solutions containing either NaI or KI with other salts (e.g. NH₄Cl, KBr). The presence of a single ligand accelerated the rate of reaction with ozone in the order I(H₂O)^─ (ca. 1.5 × 10^-11 cm³ molecule^-1 s^-1) < I(NaCl)^─ ≈ I(NaBr)^─ < I(NaI)^─ < I(KI)^─ (ca. 6.7 × 10^-11 cm³ molecule^-1 s^-1) relative to the bare iodide anion (1.1 × 10^-12 cm³ molecule^-1 s^-1). Addition of a further ligand approximately doubled the rate of reaction for I(KI)₂^─ (ca. 2.1 × 10^-10 cm³ molecule^-1 s^-1), emphasizing that relatively small growth in particle size has a significant impact on the rate of reaction with ozone. Together these data highlight that nanoscale particles may have an outsized role in the oxidizing capacity of the troposphere and destruction of the ozone layer in the stratosphere.

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