title: Isotope exchange in ionised CO2/CO mixtures: the role of asymmetrical C2O3+ ions.
abstract: A hitherto unknown, atmospherically relevant, isotope-exchange reaction was studied in ionised gaseous mixtures containing carbon dioxide and monoxide. The mechanism of the O exchange, proceeding over a double-minimum potential-energy surface, was positively established by mass spectrometric and theoretical methods that also allowed the identification and characterisation of the C2O3+ intermediate. The increase of internal energy displaces the observed reactivity towards an endothermic reaction path that involves only CO2 and represents an indirect route to the dissociation of carbon dioxide.
authors.affiliation: Dipartimento di Studi di Chimica e Tecnologia delle Sostanze, Biologicamente Attive, Università La Sapienza, P.le Aldo Moro 5, 00185 Rome, Italy. giulia.depetris@uniroma1.it
authors.forename: Giulia
authors.initials: G
authors.lastname: de Petris
authors.forename: Antonella
authors.initials: A
authors.lastname: Cartoni
authors.forename: Marzio
authors.initials: M
authors.lastname: Rosi
authors.forename: Anna
authors.initials: A
authors.lastname: Troiani
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Angelini
authors.forename: Ornella
authors.initials: O
authors.lastname: Ursini