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The double electron capture process by He'+ ions in collisions with helium is studied in the high velocity regime with the measurement of total cross sections at 1.5, 4 and 6 MeV beam energy and angular differential cross sections far 1.5 MeV. The experimental results compare well with theoretical calculations which include correlation effects in the initial and final He ground states for the derivation of the capture amplitude in a continuum distorted-wave approximation.Electron capture processes in fast ion-atom collisions are of great interest both from theoretical and experimental points of view. One of the interests in studies of this process arises from the difficulties in describing the rapid transfer of the electron from a target hound state to a projectile bound state at high velocities (see e.g. Shakeshaft and Spruch 1979). In the case of non-radiative capture this requires a considerably

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