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Near-UV photolysis cross sections of CH_3OOH and HOCH_2OOH determined via action spectroscopy

Roehl, C. M. and Marka, Z. and Fry, J. L. and Wennberg, P. O. (2007) Near-UV photolysis cross sections of CH_3OOH and HOCH_2OOH determined via action spectroscopy. Atmospheric Chemistry and Physics, 7 (3). pp. 713-720. ISSN 1680-7316. doi:10.5194/acp-7-713-2007.

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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.

Item Type:Article
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Roehl, C. M.0000-0001-5383-8462
Wennberg, P. O.0000-0002-6126-3854
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.
Funding AgencyGrant Number
Environmental Protection Agency (EPA)R824970-01-0
Issue or Number:3
Record Number:CaltechAUTHORS:ROEacp07
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ID Code:7569
Deposited By: Archive Administrator
Deposited On:05 Mar 2007
Last Modified:08 Nov 2021 20:43

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