title: Generation of the organo-rare gas dications HCCRg2+ (Rg = Ar and Kr) in the reaction of acetylene dications with rare gases.
abstract: Using doubly ionized acetylene as a superelectrophilic reagent, the new rare-gas compounds HCCAr2+ and HCCKr2+ have been prepared for the first time in hyperthermal collisions of mass-selected C2H2(2+) with neutral rare gases (Rg). However, electron transfer from the rare gas to the acetylene dication as well as proton transfer from C2H2(2+) to the rare gas efficiently compete with formation of HCCRg2+. The computational investigations show that the formation of HCCRg2+ from acetylene dication is endothermic with Rg = He, Ne, Ar and Kr and only weakly exothermic with Xe. These energetic factors, as well as the pronounced competition with the other reactive channels help to explain why HCCRg2+ is only observed with Rg = Ar and Kr.
authors.affiliation: Department of Physics, University of Trento, Via Sommarive 14, 38100 Povo, Trento, Italy. ascenzi@science.unitn.it
authors.forename: Daniela
authors.initials: D
authors.lastname: Ascenzi
authors.forename: Paolo
authors.initials: P
authors.lastname: Tosi
authors.forename: Jana
authors.initials: J
authors.lastname: Roithová
authors.forename: Claire L
authors.initials: CL
authors.lastname: Ricketts
authors.forename: Detlef
authors.initials: D
authors.lastname: Schröder
authors.forename: Jessica F
authors.initials: JF
authors.lastname: Lockyear
authors.forename: Michael A
authors.initials: MA
authors.lastname: Parkes
authors.forename: Stephen D
authors.initials: SD
authors.lastname: Price