| Electronic edge | |
The cluster represents the region of a solid close to the
emitter. The solid is assumed to extend towards negative
values of z. The electronic edge is taken as the
value of z below which the photoelectron can suffer
inelastic losses. Therefore, the electron inelastic mean
free path will apply while the photoelectron is moving
inside the solid, that is, for z below the electronic edge.
Besides, the photoelectron suffers refraction when it crosses
the electronic edge, and this is accounted for by a transmission
factor and a change of angles of emission as described by a
step potential of height V0 (see inner potential).
