The charge state and energy dependences of Transfer Ionization (TI) and Single Capture (SC) processes are being investigated. The collision systems reported here areO(4–8)+ions interacting with Helium. The measurement is being made for beam energy 1 MeV/u using a supersonic He jet with two-stage collimation. A recoil ion momentum spectrometer is used to separate TI and SC by recording the longitudinal momentum transfer and time-of-flight of the recoil ions. A magnetic field is used to control the position of the recoil ions on the detector. The ratios of TI to SC are determined with high accuracy and are compared with previous results. Higher Z-ions are under investigation. ©2001 American Institute of Physics.