Electron-impact Ionization Data

Time-of-flight Spectrum To the right is a the time-of-flight spectrum of CCl4 product ions generated by 100 eV electron impact. Lighter ions travel faster and arrive at the detector sooner; thus the C+ ions reach the detector more than a microsecond before the heavier CCl3+ ions. The area under each peak is a measure of the cross section for production of that particular ion. For more information see Lindsay et al. (2004).

Electron-impact Ionization of NH3 The figure to the right shows plots of several partial cross sections for production of various product ions as a function of the energy of the ionizing electrons. Our data are in red. The other data are from Mark et al. (1977) (squares), Rao and Srivastava (1992) (diamonds), and Tarnovsky et al. (1997) (triangles). The discrepancies between the measurements are explained in terms of differences in collection efficiency. For further information see Rejoub et al. (2001).