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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. (2006) Near-UV photolysis cross sections of CH_3OOH and HOCH_2OOH determined via action spectroscopy. Atmospheric Chemistry and Physics Discussions, 6 (6). pp. 11597-11620. ISSN 1680-7367. https://resolver.caltech.edu/CaltechAUTHORS:ROEacpd06b

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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 cm^2 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
Related URLs:
URLURL TypeDescription
http://www.copernicus.org/EGU/acp/acpd/6/11597/acpd-6-11597.htmOtherUNSPECIFIED
ORCID:
AuthorORCID
Roehl, C. M.0000-0001-5383-8462
Wennberg, P. O.0000-0002-6126-3854
Additional Information:© Author(s) 2006. This work is licensed under a Creative Commons License. Received: 18 October 2006 – Accepted: 2 November 2006 – Published: 20 November 2006 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. SRef-ID: 1680-7375/acpd/2006-6-11597
Funders:
Funding AgencyGrant Number
NSFATM-0432377
Environmental Protection Agency (EPA)R824970-01-0
Issue or Number:6
Record Number:CaltechAUTHORS:ROEacpd06b
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:ROEacpd06b
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6993
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:04 Jan 2007
Last Modified:02 Oct 2019 23:38

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