Abstract
Structures and electronic states in the ground state of endohedral fullerence are investigated by XAFS analysis and XANES spectrum. The distances between the Eu ion and the neighboring C atoms show clearly that the Eu ion is inside the C60 cage. The endohedral element, Eu, in C60 is located away from the central position of C60 cage by 1.4 Å. We show the detailed location of the Eu ion in the C60 cage by XAFS and the first principles calculation. The perturbation theory indicates that the distortion of C60 cage and the shift of the Eu ion are attributed to electron-nuclear interaction, pseudo-Jahn–Teller type interaction. XANES spectrum of Eu LIII-edge shows that the valence of the Eu ion is close to +2. The electron configuration is thus f7, showing the total symmetry (A1g) of Ih group. The details of the structures and the electronic states will be discussed with both the experimental and theoretical results.
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