Measurements of the field emission fluctuations of an adsorption system were performed. It was deduced that K surface diffusion along a [111]-type direction on the (112) plane could be described by:

D (cm2/s) = 4.0 x 10-2 exp[-0.70(eV)/kT]

J.Beben, C.Kleint, R.Meclewski: Surface Science, 1989, 213[2-3], 438-50