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Effects of target polarization in electron elastic scattering off endohedral A @C 60

We have developed an eﬃcient approximation to describe the low-energy electron elastic scattering oﬀ an endohedral fullerene A @C N . It accounts for polarization of A @C N by incoming electrons without reference to complicated details of the electronic structure of C N itself. The developed approach has permitted us to unravel spectacular A @C N -polarization eﬀects in low-energy e + A @C N elastic scattering, particularly the eﬀects due to interelectron interaction between the electrons of both C N and A . We show that contribution of a single atom A remains unscreened by the multiatomic C N despite the projectile’s wavelength is bigger than the size of the target. Inclusion of A and C N polarizability interference leads to violation of the previously predicted phase additivity rule. The partial scattering cross sections acquire prominent Ramsauer-type minima which, however, disappear in the total cross section. The study reveals notable trends in e + A @C N elastic scattering versus the polarizability of an encapsulated atom. We also predict the existence of certain negative ions A @C − N . We chose Ne, Xe and Ba as atoms A , and C 60 as the endohedral C N , as the case study. The work focuses on a reasonable compromise between the qualitative and quantitative aspects of the problem in general rather than on carrying out detailed calculations for one particular system