Defects observed by electron microscopy in gold bombarded with keV gold ions III. Stereo study of subcascade cluster geometries

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Abstract
The geometricai arrangement of visible subcascade defect clusters (i.e. subclusters) formed in large displacement cascades was investigated in single crystal gold films after 120 keV gold ion bombardment at 295 °K along [001] using electron stereomicroscopy. It was concluded that the subclusters were vacancy type defects formed in situ at vacancy rich subcascade regions in displacement cascades as described in Parts I and II of the present work. Measurements were made of the sizes and separations of the subclusters in 69 cascade regions, each of which contained either two or three subclusters. The angular directions of the lines constructed between subcluster centers in each cascade were also measured. The observations were consistent with a model in which the first subcluster was produced at a subcascade resulting from the dechanneling of an incident ion which was initially channeled along [001]. Further subclusters were then formed by either the deflected incident ion or by energetic knock-ons. It was concluded that a substantial portion of the total energy of the incident ion was used to produce the subcascades responsible for the visible subclusters. Also, many of the energetic particles which produced the subcascades must have been quasi-channeled.

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