Inelastic photoelectron scattering in CO doped solid Ar has been inves
tigated using the method of luminescence excitation spectroscopy. The
threshold energies for multiplication of electronic excitations under
selective excitation by synchrotron radiation have been measured. For
specially selected radiative decay channels, different kinds of photoe
lectron scattering are observed. The observation of multiple electroni
c excitation is of particular interest. (C) 1997 Elsevier Science B.V.