Does a Sodium Atom Bind to C60?

Abstract
A Multi-Reference Configuration-Interaction study of the NaC60 system is presented. It is shown that the experimentally measured dipole moment of this system can be explained by the existence of a charge-transfer state of Na(+)C60(-) nature. Moreover, the present work shows that Configuration-Interaction techniques based on local orbitals permit a Multi-Reference treatment of systems containing several tens of atoms.