Ionization Produced by 5-Mev Alpha Particles in Argon Mixtures

Abstract
It is shown that when small amounts of impurities are added to argon extra ionization is produced by alpha particles moving through the gas. These effects are studied as a function of the ionization potential of the added impurity and it is found that the ionization increases even when the ionization potential is much higher than the well-known metastable state of argon.