The Production Of Negative Ions From Atom-solid Surfaces Scattering

Ions/atoms surface interaction is an important aspect of the ray-matter interaction. Previous studies have found that the negative ion formation from the ions or atoms in grazing scattering from the surface reveals some new phenomenon that the existing theoretical models are difficult to explain. Based on that, this thesis mainly contributes to this subject involving the negative ion formation on insulator surfaces.We suggested that the detachment of negative ions in the interaction of the active anion sites of the crystal surface can be considered as the tunneling process for the outmost weakly bound electron. Combined with the Demkov model used in ion-atom collisions, a new model has been proposed to deal with atoms and ions in grazing scattering from the metal and dielectric crystal surfaces. For H, O and F-LiF (KCl, KI) systems, it is found that the theoretical results are in good agreement with the experimental data.