Ion-beam induced current in high-resistance materials

The peculiarities of electric current in high-resistance materials, such as semiconductors or semimetals, irradiated by ion beams are considered. It i s shown that after ion-beam irradiation an unusual electric current may ari se directed against the applied voltage. Such a negative current is a trans ient effect appearing at the initial stage of the process. The possibility of using this effect for studying the characteristics of irradiated materia ls is discussed. A new method for defining the mean projected range of ions is suggested.