Abstract
Time resolved ESR studies of some acceptor type GIC, HOPG/AsF 5 and HOPG/BF 3/F 2, are reported. Free induction decay (FID) spectroscopy yields the dynamical relaxation time T 2 ∗ associated with mobile spins. T 2 ∗ was found to be almost isotropic and only slightly temperature dependent. T 2 ∗ times are consistent with CW-ESR linewidths measured on the same samples. In additionn, we found a weak Hahn echo at g ≈ 2 for several HOPG/AsF 5 GIC below T = 20K. The Hahn echo signal is attributed to localized spins on the graphite layers.
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