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Electron-Ion Collision Data Base
One important data base for fusion energy is the description of electron-ion collisions. This data base has been extremely difficult to establish due to the collision density in electron-ion systems. The interest is in getting not only total cross sections but cross section differential in energy and angle of the outgoing products. Storage rings have provided total cross section data on processes which involve charge changing collisions. Very few electron-ion merged beam experiments have been performed to date. Over the last few years the Macdonald Lab has been instrumental in developing a method of extracting e-ion cross sections from ion-atom collisions. The method has lead to the determination of the differential electron-ion elastic scattering and the differential electron-ion inelastic scattering. The results immediately yielded a previously unobserved q-dependence, electron diffraction in angular distribution of the electrons, and the observation of strong resonances in the two or more electron systems. Theory is being developed to understand the observed phenomena.