LOW-ENERGY ELECTRON ELASTIC POTENTIAL BACKSCATTERING BY Mg+ AND Zn+ IONS IN THE ENERGY-DEPENDENT RANGE OF ANGES E.Yu. REMETA * , Yu.Yu.BILAK # , L.L. SIMON # * Institute of Electron Physics, 294016 Uzhgorod, Ukraine # Uzhgorod State University, 294000 Uzhgorod, Ukraine Some properties of the function measured by the trochoidal electron monochromator (TEM) within the energy-dependent range of angles of the back hemisphere for electron elastic potential backscattering by ions of alkaline-earth atoms have been considered theoretically.