Raman and infrared spectra of Tm@C-82 and Gd@C-82

Raman and infrared spectra of the three Tm@C-82 isomers and of Gd@C-82 were used to study the electronic state of endohedral fullerenes. It is shown t hat the determination of the electronic state is possible from the wave num ber of the metal cage Raman mode below 200 cm(-1). Moreover a significant i nfluence of the C-82 cage structure on the internal vibrations of the three Tm@C-82 isomers A, B and C was found. (C) 1998 Elsevier Science Ltd. All r ights reserved.