Actinic Wavelength Action Spectroscopy of the IO - Reaction Intermediate

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 r...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2021-12, Vol.12 (49), p.11939-11944
Main Authors: McKinnon, Benjamin I, Marlton, Samuel J P, Ucur, Boris, Bieske, Evan J, Poad, Berwyck L J, Blanksby, Stephen J, Trevitt, Adam J
Format: Article
Language:English
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Summary: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 + O 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 ( P) over 637-459 nm (15700-21800 cm ) because of excitation to the bound first singlet excited state. Electron photodetachment competes with photodissociation above the electron detachment threshold of IO at 521 nm (19200 cm ) with peaks corresponding to resonant autodetachment involving the singlet excited state and the ground state of neutral IO possibly mediated by a dipole-bound state.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.1c03456