Measurements were performed by using a surface ionization ion microscope. It was found that K diffusion on O-covered (112) surfaces at very low K coverages could be described by:

D (cm2/s) = 9.0 x 10-1 exp[-0.60(eV)/kT]

along the channels, and by:

D (cm2/s) = 2.0 x 10-1 exp[-0.72(eV)/kT]

at 60º to the channels:

B.Bayat, H.W.Wassmuth: Physics Letters A, 1986, 115[5], 225-9