We have studied the fundamental process of ionization in a pure three-body ion - atom collision involving atomic hydrogen as a target and a bare heavy-ion as a projectile. We report the measurements of the double-differential cross section (DDCS) of ionization for . The measurements of the energy and angular distributions of the double-differential cross sections of the low-energy electrons and a comparison with the CDW-EIS and FBA calculations provide a detailed understanding of the two-centre mechanism of electron emission. The forward - backward asymmetry parameters have also been studied. The DDCS ratio between molecular and atomic hydrogen shows a prominent structure.