Determination of the Sickafus index by positron-stimulated secondary electron emission

摘要: Abstract Measurements are presented of the energy distribution secondary electrons ejected from copper by an incident positron beam 2 keV. The results show that fast is characterised form proposed Sickafus, AE−m, where m ≈ 2. Earlier theoretical calculations and experimental observations suggest that, for electron beams 5 keV higher, closer to unity. By using problems associated with indistinguishability low-energy backscattered primary eliminated, allowing measurements be taken at low projectile energies a more accurate determination made Sickafus index m.