Kinetic Energies of Fragment Ions from n-Butane Resulting from Electron Impact

Abstract

Abstract The discrimination effect on the fragment ions from n-butane produced by electron impact has been investigated using a conventional mass spectrometer. From the effect of discrimination, it has been concluded that the relative intensity of fragment ions with initial energies larger than their thermal energy is markedly dependent on the conditions of measurement. On the basis of the information gained about the effect of discrimination on ions, the amount of the kinetic energy for fragment ions from n-butane has been estimated. From the results of our experiments, it is reasonable to consider that considerable portions of C3H3+, C3H4+, C2H4+ and C2H3+ions are produced with high kinetic energies from the dissociation of the doubly-charged molecule-ion, according as the high kinetic enegy of the CH3+ ion is produced.