The method developed by Baker and Hasted to study electron-ion collision has been applied to the electron-helium-ion collision. Helium ions were trapped in the space charge of a magnetically confined electron beam and the reactions taking place were studied using a mass spectrometer. The ionization of He⁺ has been clearly demonstrated. The destruction of He²⁺ ions in the trap, probably by radiative charge transfer, He²⁺ +He -> He⁺ +He⁺ +hv has also been shown to take place.