Abstract
The ground states for large icosahedral fullerenes and for ${\mathrm{C}}_{60}^{\mathit{n}}$ molecular ions (-6\ensuremath{\le}n\ensuremath{\le}+1) are treated starting from full rotational symmetry and the use of Hund's rule. Treating the icosahedral symmetry as a subgroup of the full rotational group, the icosahedral symmetry of these molecular states is introduced. A method to calculate the electronic structures for the icosahedral molecules and ions is formulated for large fullerenes using a spherical harmonic expansion on a sphere, and the calculated results for ${\mathrm{C}}_{60}$ are compared with molecular orbital calculations.
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