Abstract
Thinning by ion-bombardment is a useful technique for the preparation of carbon and other fibres for transmission electron microscopy. It is shown that the presence of axial ridges on the initial fibre leads to the development of striations perpendicular to the axis of the thinned specimen. An analysis of the variation of ion incidence angle on a rotating cylinder enables the change in shape of a fibre on sputtering to be explained; scanning electron microscopy of sputtered fibres confirms these conclusions. A mechanism for the formation of striations perpendicular to pre-existing ridges on the fibre is proposed.
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