Kinetic electron ejection by scattered neutralized positive ions

Abstract

A crude energy analysis of positive secondary currents (measured on the collecting surfaces) from clean single-crystal targets of tungsten, molybdenum and vanadium, as well as polycrystalline tungsten, indicates that significant proportions of the currents measured result not only from sputtered target ions but also from kinetic electron ejection from the collecting surfaces by scattered incident particles. Some correlation has been achieved with kinetic ejection thresholds calculated according to simple hard-shape collision theory.