ENERGY-DEPENDENCE OF THE PROTON-INDUCED CONVOY ELECTRON YIELD

In this work the convoy electron yield of protons penetrating a 60 nm carbon foil with energies in the range from 40 keV up to 400 keV was m easured. A maximum yield at about 100 keV proton energy was found. The decrease of the yield to higher proton energies follows a power law w ith an exponent of n = 2.2. The convoy electron yield also decreases, while the fraction of neutralized projectiles increases. The results f or energies above the maximum are discussed on the basis of electron c apture by the protons on the backside of the foil.