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The energy-resolved electron-momentum density of fullerene has been measured. Clear differences are found from the energy-momentum densities of either diamond or graphite. The energy-momentum density of fullerene can be described as being composed of a σ band and a split π band. The observed spectral momentum densities are compared to the calculated orbitals of a C₆₀ molecule in momentum space. Good agreement is found. A simple classification of the orbitals is proposed that explains elegantly the calculated and observed structures. The splitting of the π band can be interpreted as a consequence of the curvature of the carbon network forming the fullerene molecule.
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Vos et al. (1997) studied this question.
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