Abstract
Ultraviolet photoelectron spectra of C 84, one of the fullerene family compounds, and of potassium-dosed C 84 have been measured with synchrotron radiation. The spectra of C 84 are compared with those of C 60 and C 70. The photoemission spectral onset of C 84 is 1.3 eV below the Fermi level, which is smaller by 0.5 eV than that of C 60 or C 70. This indicates its small band gap, which was expected from its absorption spectra. Upon potassium dosing, a new band becomes distinct between the Fermi level and the highest occupied molecular orbital band. The new band edge does not cross the Fermi level, which indicates that potassium-dosed C 84 is not metallic but a semiconductor.
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