Volume 50, Number 2, April II 2000
|Page(s)||209 - 215|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Ripple topography of ion-beam–eroded graphite: A key to ion-beam–induced damage tracks
II. Physikalisches Institut and Sonderforschungsbereich 345
Georg-August Universität Göttingen - Bunsenstr. 7-9, D-37073 Göttingen, Germany
2 Institut für Strahlenphysik - Universität Stuttgart Allmandring 3, D-70569 Stuttgart, Germany
3 I. Physikalisches Institut and Sonderforschungsbereich 345 - Georg-August Universität Göttingen, Göttingen, Germany
Accepted: 27 January 2000
The ripple topography of ion-beam–eroded surfaces offers a novel method to determine the shape of collision cascades and the distribution of deposited energy. From the energy dependence of the ripple spacing of Ar+- and Xe+-irradiated graphite surfaces at ion energies between 2 and 50 keV, the relations between mean depth, longitudinal and lateral straggling of the damage cascade were obtained. Their evolution with the ion energy was found to follow power laws for both ion masses and implies an energy-independent lateral spread of the damage cascade, while depth and longitudinal spread scale with the ion energy. This can be explained by the nuclear stopping power being nearly independent of energy in the observed region. High-resolution micrographs of single-ion impacts support this interpretation, as the hillock-shaped surface defects found in the experiments show a lateral extension being independent of the ion energy.
PACS: 68.35.Bs – Surface structure and topography / 79.20.Rf – Atomic, molecular, and ion beam impact and interactions with surfaces / 81.05.Tp – Fullerenes and related materials; diamond, graphite
© EDP Sciences, 2000
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