Moessbauer experiments with Coulomb excited 57Fe after recoil implantation into fcc-lattices

We studied the Mössbauer effect of 57Fe at room temperature, excited by Coulomb excitation and implanted under vacuum in matrices of copper, silver, and aluminum. The Mössbauer parameters allow us to conclude that recoil atoms substitute for normal sites in the Cu and Ag lattices in less than 10^-7 s. A slight broadening of the resonance line of Fe in Ag may arise from some radiation damage. In the case of 57Fe implanted in Al, we believe that a high proportion of the excited recoil nuclei come to rest in an interstitial position, with the remainder being stopped in substitutional sites of the lattice.