Electron impact ionization of nitrous oxide was studied as a function of electron energy up to 180 eV. A double focusing mass spectrometer in combination with an improved electron impact ion source (Stephan et al.) was used, alleviating the problems of ion extraction from the source and the transmission of the extracted ions through the mass spectrometer system. Relative partial ionization cross sections were measured for the process N2O+e→N2O++2e. These cross sections were calibrated absolutely by normalizing the relative cross sections with two different methods. A difference obtained in the absolute cross section values is explained by the delayed unimolecular dissociation process N2O+ to NO++N. Both metastable and collision induced dissociation of N2O+ were studied quantitatively using the well established technique of decoupling the acceleration and deflection electric fields.
Electron impact ionization of nitrogen dioxide has been studied as a function of electron energy up to 180 eV with a double focussing mass spectrometer Varian MAT CH5 and an improved Nier type electron impact ion source. We report the first observation of NO2++ produced via electron impact. Relative partial ionization cross section functions have been obtained for the processes NO2+e→NO2++2e and NO2+e→NO2+++3e. An accurate measurement of the cross section ratio q (NO2++/NO2) /q(NO2+/NO2) has been performed. In addition an estimate of the absolute partial cross sections has been made normalizing the measured relative cross section against the Ar+ cross section with the method of molecular effusive flow. Using the nth root extrapolation the following ionization potentials have been derived from the cross section functions near threshold: NO2+ = (10,4±0,3) eV and NO2++ = (35,0±0,5) eV.
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