title: Electron interaction with nitromethane embedded in helium droplets: attachment and ionization measurements.
abstract: Results of a detailed study on electron interactions with nitromethane (CH(3)NO(2)) embedded in helium nanodroplets are reported. Anionic and cationic products formed are analysed by mass spectrometry. When the doped helium droplets are irradiated with low-energy electrons of about 2 eV kinetic energy, exclusively parent cluster anions (CH(3)NO(2))(n)(-) are formed. At 8.5 eV, three anion cluster series are observed, i.e., (CH(3)NO(2))(n)(-), [(CH(3)NO(2))(n)-H](-), and (CH(3)NO(2))(n)NO(2)(-), the latter being the most abundant. The results obtained for anions are compared with previous electron attachment studies with bare nitromethane and nitromethane condensed on a surface. The cation chemistry (induced by electron ionization of the helium matrix at 70 eV and subsequent charge transfer from He(+) to the dopant cluster) is dominated by production of methylated and protonated nitromethane clusters, (CH(3)NO(2))(n)CH(3)(+) and (CH(3)NO(2))(n)H(+).
authors: Institut für Ionenphysik und Angewandte Physik and Centre of Molecular Biosciences Innsbruck, Universität Innsbruck, Innsbruck, Austria.
authors: F
authors: F
authors: Ferreira da Silva
authors: S
authors: S
authors: Ptasińska
authors: S
authors: S
authors: Denifl
authors: D
authors: D
authors: Gschliesser
authors: J
authors: J
authors: Postler
authors: C
authors: C
authors: Matias
authors: T D
authors: TD
authors: Märk
authors: P
authors: P
authors: Limão-Vieira
authors: P
authors: P
authors: Scheier
mesh_terms: D000838:Anions / Q000737:chemistry; D002412:Cations / Q000737:chemistry; D004583:Electrons; D006371:Helium / Q000737:chemistry*; D013058:Mass Spectrometry; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D008745:Methylation; D009595:Nitroparaffins / Q000737:chemistry*; D011522:Protons; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D000838:Anions; D002412:Cations; D009595:Nitroparaffins; D011522:Protons; D014867:Water; D006371:Helium; D008697:Methane; C008640:nitromethane