Synopsis The negative hydrogen ion H-plays a major role in many processes relevant for physics, cosmology, astrophysics and chemistry.In this work we show that H-ions can be formed by collision-induced fragmentation of molecules containing hydrogen and heavier nuclei.We report the observation of H-emission from OH+ + Ar and OH+ + acetone collisions at the impact energy of 7 keV.The data suggest a process of electron-grabbing by fast hydrogen fragments created in hard collisions, where the momentum transfer between atomic cores is large.