Abstract
Let me start with some historical remarks before I will concentrate on recent experimental advances on scattering experiments involving polarized electrons. Collisions of electrons with atoms and molecules have been studied for about one hundred years. The general behaviour of the cross section for those collisions is plotted on Figure 1 where some of the pioneering work is also mentioned. Lenard (since 1893) studied total cross sections and found a strong decrease of the cross section with increasing energy. Franck and Hertz (1913) discovered discrete excitation levels, whereas Ramsauer and Townsend (1920) found that some targets exhibit a deep cross section minimum at very low energies, which must be explained by the wave nature of the electron beam. Schulz (1963) discovered sharp resonance structures which are temporary negative ion states.
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Hanne, G.F. (1997). Scattering of Polarized Electrons from Atoms and Molecules. In: Burke, P.G., Joachain, C.J. (eds) Photon and Electron Collisions with Atoms and Molecules. Physics of Atoms and Molecules. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5917-7_22
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