CONVOY ELECTRON AND ION-SCATTERING DISTRIBUTIONS AFTER PENETRATION OFPROTONS THROUGH THIN FOILS

In a beam foil experiment the angular distribution less-than-or-equal- to\+/- 6-degrees\ of convoy electrons and of the protons were measured for ion energies between 100 and 300 keV. Al foils of 50 nm thickness were used. It was found that the number of emitted convoy electrons d epends only weakly on the exit angle while the ion current decreases b y more than two orders of magnitude with increasing scattering angle. By coincidence measurements for different emission directions a low co rrelation between ions and electrons was observed. Therefore, it was c oncluded that most of the convoy electrons are scattered away from the ion beam and do not form pairs with the ions.