Energy Distribution of Electrons from Ionizing Collisions of Atoms and Ions

The energy distribution of electrons ejected in collisions of Ne ions with Ne and He atoms, He ions in Ne, and Kr, and Xe ions and neutral atoms in Kr and Xe, respectively, have been measured for ion energies from 0.3 to 3.0 keV. The spectra consist of a continuous distribution decreasing monotonically with electron energy, on which there are superimposed electron groups of definite energy characteristic of the colliding particles. The nature and origin of these groups are discussed.