It has been well established that the Coulomb force alone can produce spin-dependent effects for electron-impact excitation of heavy rare-gas atoms if the incident electrons are spin polarized and the final J state of the atom is resolved. This effect has become known as the fine-structure effect. Here we demonstrate that the same type of effect may be expected for electron-impact ionization.
S. J. Jones et al., "Spin-Resolved (e,2e) Coincidences for Heavy Rare-Gas Targets," Physical Review Letters, vol. 72, no. 16, pp. 2554-2556, American Physical Society (APS), Apr 1994.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.72.2554
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