UV-visible Spectra and Gas-Phase Rate Coefficients for the Reaction of 2,3 pentanedione and 2,4-pentanedione with OH Radicals

L. Messaadia (1, 2) , G. El Dib (3) , Azeddine Ferhati (1) , Abdel Chakir (4)

1 LCCE - Laboratoire de Chimie et Chimie de l'Environnement
2 Faculté des Sciences Exactes et Informatique Département de Chimie
3 IPR - Institut de Physique de Rennes
4 GSMA - Groupe de spectrométrie moléculaire et atmosphérique

The UV absorption cross-sections of 2,3-pentanedione and 2,4-pentanedione were measured and their reactions with OH were investigated in the gas-phase using a relative rate method. A temperature dependence of the rate coefficients was observed for both reactions over the temperature range 298–338 K. This work provides the first UV cross-section in the gas phase for 2,4-pentanedione and the first kinetic data for the reaction of 2,3-pentanedione with OH radicals as a function of temperature. The tropospheric lifetimes obtained in this work suggest that once emitted into the atmosphere, these species could be quickly degraded close to their emission sources.

Domaines: Physique Atmosphérique et Océanique [physics.ao-ph]

L. Messaadia, G. El Dib, Azeddine Ferhati, Abdel Chakir. UV-visible Spectra and Gas-Phase Rate Coefficients for the Reaction of 2,3 pentanedione and 2,4-pentanedione with OH Radicals. Chemical Physics Letters, 2015, 626, pp.73-79. ⟨10.1016/j.cplett.2015.02.032⟩. ⟨hal-01125946⟩