title: Dissociative electron attachment to glycyl-glycine, glycyl-alanine and alanyl-alanine.
abstract: The processes of negative ions formation of dipeptides glycyl-glycine, glycyl-alanine and alanyl-alanine in the conditions of resonant electron capture have been studied with a help of negative ions mass spectrometry. Using a thermochemical approach, the main channels of fragment negative ions formation were found and the structure of the ions were established. The isobaric ions have been identified by the experiments with high mass resolution. The cross sections of fragment ions formation were measured. The metastable fragmentation of [M-H](-) and [M-COOH](-) ions in the energy range 4.5-7.5 eV have been found.
authors.affiliation: Institute of Molecular and Crystal Physics, Ufa Research Center, Russian Academy of Sciences, Ufa, Russian Federation, 450075.
authors.forename: M V
authors.initials: MV
authors.lastname: Muftakhov
authors.forename: P V
authors.initials: PV
authors.lastname: Shchukin
mesh_terms: D004151:Dipeptides / Q000737:chemistry*; D004583:Electrons; D006033:Glycylglycine / Q000737:chemistry
chemical_list: D004151:Dipeptides; D006033:Glycylglycine; C002956:alanylalanine; C065992:N-glycylalanine