Electronic structure of single crystal C"6"0 - Wu, J.; Shen, Z.-X.; Dessau, D.S.; Cao, R.; Marshall, D.S.; Pianetta, P.; Lindau, I.; Yang, X.; Wells, B.O.; Brown, C.A.; Elloway, D.; King, D.M.; et al. (Elsevier)
We report angle-resolved photoemission data from single crystals of C"6"0 cleaved in UHV. Unlike the other forms of pure carbon, the valence band spectrum of C"6"0 consists of many sharp features that can be essentially accounted for by the quantum chemical calculations describing individual molecules. This suggests that the electronic structure of solid C"6"0 is mainly determined by the bonding interactions within the individual molecules. We also observe remarkable intensity modulations of the photoemission features as a function of photon energy, suggesting strong final state effects. Finally, we address the issue of the band width of the HOMO state of C"6"0. We assert that the width of the photoemission peak of C"6"0 does not reflect the intrinsic band width because it is broadened by the non 0-0 transitions via the Franck-Condon principle. Our view point provides a possible reconciliation between these photoemission data and those measured by other techniques.
http://linkinghub.elsevier.com/retrieve/pii/0921-4534(92)90007-Y
Keywords: U