title: Internal energy effects on the ion/molecule reactions of ionized methyl isocyanide.
abstract: Electron ionization of methyl isocyanide in various chemical ionization conditions is reported and, depending on the energy conditions used, different ion/molecule reactions are observed. It is proposed, on the basis of combined quantum chemical (DFT) calculations and tandem mass spectrometric experiments, that a common intermediate could be a cumulenic ionized dimer dissociating in the ion source following two energy depending competitive channels, a loss of a hydrogen atom and a loss of a methyl group. Proposed structures for new cumulenic ions are supported by collision experiments in the high (collisional activation) or/and low (collision- induced dissociations) translational energy regime.
authors.affiliation: Laboratory of Organic Chemistry-Center of Mass Spectrometry-University of Mons-Hainaut, Avenue Maistriau 19, B-7000 Mons, Belgium. robert.flammang@umh.ac.be
authors.forename: Robert
authors.initials: R
authors.lastname: Flammang
authors.forename: Julien
authors.initials: J
authors.lastname: De Winter
authors.forename: Pascal
authors.initials: P
authors.lastname: Gerbaux
authors.forename: Vinh Son
authors.initials: VS
authors.lastname: Nguyen
authors.forename: Minh Tho
authors.initials: MT
authors.lastname: Nguyen