Abstract
X-ray absorption near-edge structure (XANES) spectra of fullerenes C 60, C 70 and C 76 were measured at the K-edge of carbon. Comparison of XANES and inverse photoemission spectra of C 60 and C 70 revealed that the core excitonic effects is small, indicating the usefulness of XANES spectroscopy for probing the density of unoccupied states (DOUS) of fullerenes. The variation of the magnitude of the core excitonic effect among various delocalized π-electron systems is discussed in relation to the dimensionality and size of the systems. The observed XANES spectra were compared with theoretically calculated DOUS.
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