Abstract
The effect of isotopic substitution of 3 He for the 4 He occluded compounds of C 60 , C 60 -Na-H and carbon nanotube has been investigated by mass-analyzed thermal desorption spectroscopy. The peak temperatures of 3 He desorption bands of C 60 - 3 He and C 60 -Na-H- 3 He were shifted to a lower temperature than those of 4 He in C 60 - 4 He and C 60 -Na-H- 4 He. This isotope shift is explained with the mass effect related to the interstitial diffusion of helium atoms.
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