Abstract
Microporous activated carbon fibers with huge specific surface area (3000 m 2 /g) have dangling bond spins at the peripheries of micro-graphitic domains. Spin-lattice relaxation of the dangling bond spins was studied by ESR measurements in the presence of various gases, He, Ne, Ar, H 2 , N 2 , O 2 . The introduction of helium gas strongly enhances the spin-lattice relaxation rate 1/ T 1 , suggesting the contribution of the collisional process to the spin-lattice relaxation mechanism. The introduction of a simple model on the basis of the electric dipole-dipole interaction makes the calculation of 1/ T 1 possible and the obtained result can explain the experimentally observed result.
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