All-electron calculations of the multiply differential cross section of simple ionization of lithium by electron impact

The e, 2e reaction of lithium is studied as a four-electron system, whose initial and final singlet and tripler spin states produce a variety of exchange terms whose importance in the determination of the transition matrix element of the ionization process is studied systematically over a very large domain of incidence energy (50 eV to 5 keV) by applying in the small and intermediate energy domain a distorted-wave procedure concerning all continuum electrons. The comparison with experimental and recent theoretical results shows that the use of an all-electron procedure improves the agreement with the experimental results.