Near-UV photolysis cross sections of CH_3OOH and HOCH_2OOH determined via action spectroscopy
- Creators
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Roehl, C. M.
- Marka, Z.
- Fry, J. L.
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Wennberg, P. O.
Abstract
Knowledge of molecular photolysis cross sections is important for determining atmospheric lifetimes and fates of many species. A method and laser apparatus for measurement of these cross sections in the near-ultraviolet (UV) region is described. The technique is based on action spectroscopy, where the yield of a photodissociation product (in this case OH) is measured as a function of excitation energy. For compounds yielding OH, this method can be used to measure near-UV photodissociation cross section as low as 10−23 cm2 molecule−1. The method is applied to determine the photodissociation cross sections for methyl hydroperoxide (CH3OOH; MHP) and hydroxymethyl hydroperoxide (HOCH2OOH; HMHP) in the 305–365 nm wavelength range. The measured cross sections are in good agreement with previous measurements of absorption cross sections.
Additional Information
© Author(s) 2007. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License. Received: 18 October 2006 – Published in Atmos. Chem. Phys. Discuss.: 20 November 2006. Revised: 8 February 2007 – Accepted: 9 February 2007 – Published: 14 February 2007. The authors thank the National Science Foundation (ATM-0432377) and the Massachusetts Institute of Technology, Air Quality Models Project (R824970-01-0) for support of this research.Attached Files
Published - ROEacp07.pdf
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Additional details
- Eprint ID
- 7569
- Resolver ID
- CaltechAUTHORS:ROEacp07
- NSF
- ATM-0432377
- Environmental Protection Agency (EPA)
- R824970-01-0
- Created
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2007-03-05Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences