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Spin-tagged electron-hydrogen scattering: New measurements of ionisation asymmetries from threshold to 500 eV

Using beams of polarised electrons and polarised hydrogen atoms the authors measured the spin antiparallel-parallel ionisation asymmetry from threshold to 500 eV. Their measurements are generally more precise than those of earlier studies and, more significantly, are characterised by an energy spread that is at least an order of magnitude smaller than that of the earlier work. They compare their results with several theoretical models as well as with the results from similar experiments using polarised alkali atoms.