Co. Reinhold et al., CONVOY ELECTRON-EMISSION FROM SURFACES, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 99(1-4), 1995, pp. 50-53
We present results of a microscopic simulation of fast electron emissi
on in glancing-angle ion-surface collisions. Our model accounts for bo
th dynamic image interactions and multiple scattering near the surface
and predicts a pronounced convoy electron peak for small emission ang
les. Good agreement is found with our recent coincidence experiments f
or 0.2-0.5 MeV/u Li ions interacting with SnTe(001) surfaces. We find
that convoy electrons principally originate from target core states an
d are emitted while the ion is in very close proximity to the topmost
layer of target atoms. Because of the rapid charge changing cycle that
the ions undergo during emission, almost no correlation is found betw
een the convoy peak position and the final charge state of the ions.