New approach to the study of reaction mechanisms of recoil implantation

Recoil implantation is recognized to be one of the efficient methods in understanding reaction mechanisms of energetic atoms (hot atoms) in solids. Dealing with 51Cr recoil atoms and mixed crystals of complex compounds of tris(dipivaloylmethanato)iron(III) Fe(dpm)3 and tris(acetylacetonato)iron(III) Fe(acac)3 as a catcher system, the authors have discovered that recoil replacement reactions represented by the formation of 51Cr(dpm)3 or 51Cr(acac)3 are more important than the abstraction reactions represented by the formation of 51Cr(dpm)sub(x)(acac)sub(3-x) where x is 1 or 2. And the simple billiard ball collision-type mechanism does not explain the replacement reactions. It is clear that non billiard ball type mechanisms are operative in the formation of the parent type complex compounds because the reaction cross section ratio is much larger than the collision cross section ratio for the case of the present complex compounds. (author)