Study of Interatomic Potentials in ZnS using Crystal-GRID high-precision gamma spectroscopy and MD simulations

Crystal-GRID measurements have been performed with ZnS single crystals. A new Crystal-GRID potential could be determined by splining a Stillinger-Weber like equilibrium potential to screened Coulomb potentials. The new potential is fitted to experimental data containing information about the energy range of about 10 to 500 eV and differs significantly from the screened Coulomb potentials. The nuclear level life time of the 3221 keV level in 33S has been determined to be (48.8 +/- 0.7) fs. Furthermore the predicted asymmetry of a Crystal-GRID line shape could be observed for the first time.