Charge exchange measurements in helium using a double tandem accelerator‐decelerator source of low energy highly stripped oxygen ions

Cross sections for O q+‐He single electron capture have been measured for 5⩽q⩽8 within the energy range 15 to 100 keV per amu. High energy positive ions were injected into an EN tandem Van de Graaff operated at a negative voltage, producing even higher energy for foil stripping to high charge states, followed by ion deceleration to reduce the ion energy by as much as a factor of 50.