Core-hole effects in x-ray-absorption spectra of fullerenes

Near-edge x-ray-absorption fine-structure spectra of two fullerenes, C-60 a nd C-70, have been simulated by means of density-functional theory techniqu es using ground-state Kohn-Sham orbitals, transition state potentials, or f ull core-hole potentials. The very good experimental agreement obtained whe n the full core hole explicitly is taken into account gives an indication o f significant excitonic effects for the x-ray-absorption spectra of fullere nes. [S0163-1829(99)01935-9].