STRONG PCI-EFFECT IN THE EXCITATION OF Cu-SURFACE BY ELECTRON IMPACT V.M.Mikoushkin A.F.Ioffe Physical-Technical Institute, Russian Academy of Sciences, St.Petersburg, Russia Strong angle dependent PCI-effect in the excitation of Cu-surface by electron impact has been revealed by measuring Auger spectra under irradiation by x-rays (hn = 1486.6 eV) and by electrons of different energies. This effect results in Auger-line shift which is comparable to a typical chemical one.