[en] In the following paper we briefly summarize some of these results: double Rydberg Formula and applications to doubly excited states of multiply charged ions; classification of triply excited states or atoms from a molecular viewpoint; density matrix description for the hydrogenic n = 2 and 3 excited states formed in proton-helium collisions; theory of anisotropy transfer and calculations of alignment of excited states; angular distributions for charge transfer processes in ion-atom collisions; and finite-basis-set expansion method for inner shell ionization in ion-atom collisions