Abstract
The low-energy electron diffraction method with a number of original techniques has been employed to observe and study a new radiation-stimulated reconstruction transition on the CoNi 3 (1 0 0) single crystal surface. Low-energy bombardment by Ar + ions (600 eV) leads to a change of the diffraction pattern symmetry corresponding to a surface structure change f.c.c.→h.c.p. To elucidate the causes of the effect observed the changes of the surface composition and the concentration profile under the action of ion bombardment were studied. It has been found that first atomic layer of the sample is fully enriched in cobalt, and this, precisely, leads to the formation of the h.c.p. phase on the surface.
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