ELECTRON ENERGY SPECTRA AT MULTIPLE IONIZATION OF ARGON ATOMS BY 1 MeV PROTONS B.Fastrup#, E.Horsdal-Pedersen#, V.V.Afrosimov*, A.A.Basalaev*, M.N.Panov* # Institute of Physics and Astronomy, University of Aarhus, Aarhus, Denmark * Ioffe Physico-Technical Institute RAS, St.Petersburg, Russia The dependencies of single and multiple ionization cross section ratios on the ejected electron energies were measured using simultaneous analysis of recoil Ark+ ion charge state k and ejected electron energy Eel formed in the same H+ + Ar collision and registered in coincidence. It was found that formation of binary encounter electrons (BEE) correlates predominantly with single ionization whereas cusp electrons (CE) - with double and triple ones.