SE EEDF N0(Ek) for argon ions on copper oxide (Cu2O) at ion energies
of 4000 eV (a), 2000 eV (c). The symbols present the SE EEDFs from the beam
experiment. The lines connecting the data points serve as a guide for the eye. The
solid lines show the SE EEDF of the extended Hagstrum model using Pt,63=0.01,
whereas the green solid line denotes the EEDF N0 of the electrons outside the solid
and the blue solid line its convolution with a Gaussian width of 8 eV, for details see
text. The black solid line denotes the EEDF Ni(Ek) of the electrons inside the solid.

SE EEDF measurements with Colutron source.