Actinic Wavelength Action Spectroscopy of the IO– Reaction Intermediate

Abstract

Iodinate anions are important in the chemistry of the atmosphere where they are implicated in ozone depletion and particle formation. The atmospheric chemistry of iodine is a complex overlay of neutral–neutral, ion–neutral, and photochemical processes, where many of the reactions and intermediates remain poorly characterized. This study targets the visible spectroscopy and photostability of the gas-phase hypoiodite anion (IO–), the initial product of the I– + O3 reaction, by mass spectrometry equipped with resonance-enhanced photodissociation and total ion-loss action spectroscopies. It is shown that IO– undergoes photodissociation to I– + O (3P) over 637–459 nm (15700–21800 cm–1) because of..