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He Desorption of Defects in Metals

By low energy helium implantation of a metal single crystal, defects present in the metal can be decorated with helium. During linear heating with time helium dissociation from the defects is observed. Desorption peaks emerge, characteristic for certain defects. A short review will be presented of the experimental requirements together with the results obtained so far with the technique. Helium desorption from point defects like empty vacancies and vacancies occupied by a heavy noble gas atom or a foreign metal atom is discussed. The first stages of clustering of two or three adjacent point defects, can well be detected. Desorption studies of a pulsed laser irradiated single crystal indicate the formation of vacancy clusters. The interaction of self-interstitials with some of the above mentioned point defects is described.