All-electroncalculations of the multiply differential cross section of simpleionization of lithium by electron impact

Abstract

The e, 2e reaction of lithium is studied as a four-electron system, whoseinitial and final singlet and triplet spin states produce a variety ofexchange terms whose importance in the determination of thetransition matrix element of the ionization process is studiedsystematically over avery large domain of incidence energy (50 eV to 5 keV) by applying in thesmall and intermediate energy domain a distorted-wave procedure concerning all continuum electrons. Thecomparison withexperimental and recent theoretical results shows that the use of anall-electron procedure improves the agreement with the experimentalresults.