Ja. Carlisle et al., OCCUPIED AND UNOCCUPIED ORBITALS OF C-60 AND C-70, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 256, 1994, pp. 819-824
The full spectrum of occupied and unoccupied sigma and pi orbitals is
presented for solid C-60, C-70, and graphite, using Cls emission and a
bsorption spectroscopy. There are significant differences between C-60
and C-70, and even larger changes relative to their infinite analog g
raphite (C-infinity). A comparison is made with photoemission and inve
rse photoemission results, along with first principles quasiparticle c
alculations.