Dissociative electron attachment (DEA) measurements to nitromethane, CH(3)NO(2), in the gas phase have been revisited by making use of a high mass-resolution sector field instrument. Anion efficiency curves for 16 negatively charged fragments have been measured in the electron energy region from about 0 to 16 eV with an energy resolution of similar to 1 eV. Eight new anions have been detected, CH(2)NO(2)(-), CHNO(2)(-), CH(2)NO(-), H(2)NO(-), CH(3)(-), CH(2)(-), CH(-) and H(-). The five most dominant product anions are NO(2)(-), O(-), OH(-), CN(-) and CNO(-), all of them featuring two high-energy resonances at about 5 eV and 10 eV. Formation of CH2NO2- at low electron energies has been explained in terms of DEA to highly vibrationally excited molecules. The standard enthalpy of formation of CH(2)NO(2)(-) and H(-), CH(2)(-) and NO(-) radicals have been estimated as Delta(f)H(g)degrees(CH(2)NO(2)(-)) = -1.71 eV, Delta(f)H(g)degrees(H(-)) = 2.09 eV, Delta(f)H(g)degrees(CH(2)(-)) = 3.5 eV and Delta(f)H(g)degrees(NO(-)) = -1.93 eV, respectively. (c) 2007 Elsevier B.V. All rights reserved.
- Electron attachment
Alizadeh, E., da Silva, FF., Zappa, F., Mauracher, A., Probst, M., Denifl, S., Bacher, A., Mark, T. D., Limão-vieira, P. M. A. L., & Scheier, P. (2008). Dissociative electron attachment to nitromethane. International Journal of Mass Spectrometry, 271(1-3), 15-21. https://doi.org/10.1016/j.ijms.2007.11.004