Near-UV photolysis cross sections of CH<sub>3</sub>OOH and HOCH<sub>2</sub>OOH determined via action spectroscopy - Archive ouverte HAL Access content directly
Journal Articles Atmospheric Chemistry and Physics Year : 2007

Near-UV photolysis cross sections of CH3OOH and HOCH2OOH determined via action spectroscopy

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.
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Dates and versions

hal-00296144 , version 1 (18-06-2008)

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  • HAL Id : hal-00296144 , version 1

Cite

C. M. Roehl, Z. Marka, J. L. Fry, P. O. Wennberg. Near-UV photolysis cross sections of CH3OOH and HOCH2OOH determined via action spectroscopy. Atmospheric Chemistry and Physics, 2007, 7 (3), pp.713-720. ⟨hal-00296144⟩

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