Abstract
The spin-lattice relaxation mechanism of dangling bond spins in activated carbon fibers (ACF) with huge specific surface areas (∼3000m 2/g) was investigated by ESR measurements in the presence of the gases, He, Ne, Ar, H 2, N 2, and O 2. The introduction of helium gas remarkably enhances the spin-lattice relaxation rate, suggesting the participation of the collisional process of helium atoms in the spin relaxation from the dangling bond spins to the lattice. Taking into account an exceptionally large condensation of helium gas, this proves that ACF has ultra micropores which can accommodate only the small diameter helium atoms, resulting in a novel molecular sieve effect.
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