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Ashworth, Stephen A 
ORCID: https://orcid.org/0000-0003-4213-3541, Allan, Beverley J and Plane, John M C
(2002)
High resolution spectroscopy of the OIO radical: Implications for the ozone-depleting potential of iodine.
Geophysical Research Letters, 29 (10).
95-1-95-4.
ISSN 1944-8007
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Abstract
The absorption spectrum of iodine dioxide (OIO), obtained at high resolution between 540 and 605 nm by cavity ring-down spectroscopy, exhibits no evidence of coarse rotational structure. Furthermore, a laser induced fluorescence spectrum was not observed when pumping the molecule in this region of the visible spectrum. Ab initio quantum calculations were performed on the ground and first excited states of OIO. The rotational envelopes of the observed absorption bands are very satisfactorily simulated if the lifetime of the excited state is 200 ± 50 fs, indicating prompt predissociation. Quantum calculations indicate photolysis to I + O2, rather than O + IO. The estimated photodissociation rate of OIO in daylight ranges from 0.36 to 2.2 s-1, depending on the choice of absolute cross-section, which explains why OIO has only been observed in the atmosphere after sunset. Photolysis to yield atomic I will enhance the O3-depleting potential of iodine in the remote marine boundary layer.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | sdg 14 - life below water ,/dk/atira/pure/sustainabledevelopmentgoals/life_below_water |
| Faculty \ School: | Faculty of Science > School of Chemistry Faculty of Science > School of Environmental Sciences |
| UEA Research Groups: | Faculty of Science > Research Groups > Physical and Analytical Chemistry (former - to 2017) Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences |
| Depositing User: | Rachel Smith |
| Date Deposited: | 10 Feb 2011 16:40 |
| Last Modified: | 13 Feb 2023 15:30 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/21257 |
| DOI: | 10.1029/2001GL013851 |
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