Electron and nuclear spin dynamics in antiferromagnetic molecular rings

We study theoretically the spin dynamics of antiferromagnetic molecular rin gs, such as the ferric wheel Fe-10. For a single nuclear or impurity spin c oupled to one of the electron spins of the ring,we calculate nuclear and el ectronic spin correlation functions and show that nuclear magnetic resonanc e (NMR) and electron spin resonance (ESR) techniques can be used to detect coherent tunneling of the Neel vector in these rings. The location of the N MR/ESR resonances gives the tunnel splitting and its linewidth an upper bou nd on the decoherence rate of the electron spin dynamics. We illustrate the experimental feasibility of our proposal with estimates for Fe-10 molecule s.