title: Dynamics of the O(3P) + C2H4 reaction: identification of five primary product channels (vinoxy, acetyl, methyl, methylene, and ketene) and branching ratios by the crossed molecular beam technique with soft electron ionization.
abstract: The crossed molecular beam scattering technique with soft electron ionization (EI) is used to disentangle the complex dynamics of the polyatomic O(3P) + C2H4 reaction, which is of great relevance in combustion and atmospheric chemistry. Exploiting the newly developed capability of attaining universal product detection by using soft EI, at a collision energy of 54.0 kJ mol(-1), five different primary products have been identified, which correspond to the five exoergic competing channels leading to CH2CHO(vinoxy) + H, CH3CO(acetyl) + H, CH3(methyl) + HCO(formyl), CH2(methylene) + HCHO(formaldehyde), and CH2CO(ketene) + H2. From laboratory product angular and velocity distributions, center-of-mass product angular and translational energy distributions and the relative branching ratios for each channel have been obtained, affording an unprecedented characterization of this important reaction.
authors.affiliation: Dipartimento di Chimica, Università di Perugia, 06123 Perugia, Italy.
authors.forename: Piergiorgio
authors.initials: P
authors.lastname: Casavecchia
authors.forename: Giovanni
authors.initials: G
authors.lastname: Capozza
authors.forename: Enrico
authors.initials: E
authors.lastname: Segoloni
authors.forename: Francesca
authors.initials: F
authors.lastname: Leonori
authors.forename: Nadia
authors.initials: N
authors.lastname: Balucani
authors.forename: Gian Gualberto
authors.initials: GG
authors.lastname: Volpi