Nuclear magnetic resonance techniques were applied to highly nuclear spin-polarized 6Li atoms adsorbed on a Ru(001) surface. Pulsed radio frequency fields with spatial gradients were used to create magnetization patterns, in the lithium adsorbate, which decayed by atomic tracer diffusion. At 1100 to 1200K, the diffusion coefficients were of the order of 0.1cm2/s. The temperature dependence was described by,

D(cm2/s) = 10exp[-0.46(eV)/kT]

The very large pre-factor was attributed to a mean jump length of the order of 200Å.

H.Löser, D.Fick, H.J.Jänsch: Journal of Physical Chemistry B, 2004, 108[38], 14440-5