Electron induced dissociation in condensed-phase nitromethane I: desorption of ionic fragments

Bazin, Marc; Ptasińska, Sylwia; Bass, Andrew D. and Sanche, Leon (2009). Electron induced dissociation in condensed-phase nitromethane I: desorption of ionic fragments. Physical Chemistry Chemical Physics, 11(10) pp. 1610–1618.

DOI: https://doi.org/10.1039/b814219j

Abstract

Low energy electron induced dissociation of condensed nitromethane was investigated by measuring the electron stimulated desorption of anions and cations from multilayer films of CH3NO2 and CD3NO2, using a recently constructed, high sensitivity time of flight mass spectrometer. The desorbed yields were measured as a function of incident electron energy in the range between 1 to 20 eV and as function of coverage on Pt and Xe substrates. In anion desorption experiments, the following ions were observed: H? (D?), O?, OH? (OD?), CN?, NCO?, NO2?, CHNO2? (CDNO2?), CH2NO2? (CD2NO2?). Resonant structure seen in all anion yield functions, is attributed to dissociative electron attachment (DEA), though certain anion signals [e.g., OH? (OD?) and CH2NO2? (CD2NO2?)] are likely the result of reactive scattering by O? ions. The dominant desorbed cation signals are CD3+ and NO+, and the appearance potentials of these species were measured to be 12.2 and 11.5 eV, respectively. The present measurements provide information on how the electron-induced dissociation processes of this proto-typical explosive molecule are modulated by the condensed environment and on how initial dissociation events occurring on a particular molecule, may induce further dissociation.

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