C-13 NMR RELAXATION-TIME OF FULLERENE AS A FUNCTION OF MAGNETIC-FIELD

The C-13 spin-lattice relaxation time of C60 in carbon disulfide was m easured at four different frequencies, 50.288, 75.432, 100.576 and 150 .864 MHz. A good linear fit of T-1 as a function of B0(2) is obtained. The small value of the intercept T1(-1) at B=0 equal to 3.51 X 10(-4) s-1 shows that the chemical shift anisotropy is the dominant term to t he relaxation rate over all the frequency range considered. The correl ation time tau(c) (16 ps) obtained shows that the C60 motion may be de scribed through the Stokes--Einstein-Debye model.