  We compute, based on density-functional electronic-structure calculations,
the Coulomb couplings in the h_u highest occupied orbital of molecular C60. We
obtain a multiplet-averaged Hubbard U ~ 3 eV, and four Hund-rule-like
intra-molecular multiplet-splitting terms, each of the order of few hundreds of
meVs. According to these couplings, all C60^n+ ions should possess a high-spin
ground state if kept in their rigid, undistorted form. Even after molecular
distortions are allowed, however, the Coulomb terms still appear to be somewhat
stronger than the previously calculated Jahn-Teller couplings, the latter
favoring low-spin states. Thus for example in C60^2+, unlike C60^2-, the
balance between Hund rule and Jahn Teller yields, even if marginally, a
high-spin ground state. That seems surprising in view of reports of
superconductivity in field-doped C60^n+ systems.
