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| Titel |
Near-UV photolysis cross sections of CH3OOH and HOCH2OOH determined via action spectroscopy |
| VerfasserIn |
C. M. Roehl, Z. Marka, J. L. Fry, P. O. Wennberg |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 7, no. 3 ; Nr. 7, no. 3 (2007-02-14), S.713-720 |
| Datensatznummer |
250004560
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| Publikation (Nr.) |
 copernicus.org/acp-7-713-2007.pdf |
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| Zusammenfassung |
| 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. |
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