The field emission method was used to investigate self-diffusion on the (001), (100), (111) and (112) faces of W. The activation energies for the separation of edge atoms on the (001) and (011) planes were calculated. The resultant values were 1.19eV for the (011) plane and 1.35eV for the (001) plane.

Z.M.Stepien, J.Kukulka: Surface Science, 1989, 216[3], 505-8