Electron EM reviews the theoretical and experimental work of the last 30
years on continuous electron emission in energetic ion-atom collisions.
High incident energies for which the projectile is faster than the mean
orbital velocity of the active electron are considered. Emphasis is
placed on the interpretation of ionization mechanisms. They are
interpreted in terms of Coulomb centers associated with the projectile
and target nuclear fields which strongly interact with the outgoing
electron. General properties of the two-center electron emission are
analyzed. Particular attention is given to screening effects. A brief
overview of multiple ionization processes is also presented. The survey
concludes with a complete compilation of experimental studies of
ionization cross sections.