Near Resonant Vacancy Exchange between Inner Shells of Colliding Heavy Particles

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Abstract

During the last two decades, considerable interest has been devoted to studies of inner-shell excitation in slow ion-atom collisions. One of the fundamental processes that contributes to the production of inner-shell vacancies is charge exchange.(1–7) For inner shells close in energy, charge exchange is nearly resonant and, hence, available vacancies are transferred with high probability. When the projectile velocity is smaller than the velocity of the electron involved, the collision may be described using the molecular orbital (MO) model.(8–11) Within this model, inner-shell vacancy transfer proceeds via coupling of the MO’s transiently formed during the collision. However, vacancy transfer takes place at relatively large inter-nuclear distances in a fairly well localized coupling region where the molecular orbitals merge into atomic orbitals (AO). In this case the treatment of the collision within the framework of an atomic model is equivalent to that of a molecular model.