Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 53: Surface Nanopatterns
O 53.1: Talk
Wednesday, February 27, 2008, 15:15–15:30, MA 043
Investigation of surface modifications induced by swift heavy ions in the MeV regime. Part I: Experiment — •Sevilay Akcöltekin and Marika Schleberger — Universität Duisburg-Essen, Fachbereich Physik, Lotharstrasse 1, 47048 Duisburg
Over the past few years, ion-induced track formation on various crystal surfaces have been observed in many studies. Depending on the energy and charge state of the projectile-ions as well as the target properties, track production can turn out differently. Experimental investigation of track creation on different sample surfaces with energetic heavy 131Xe23+ (0.71 MeV/u) and 207Pb28+ (0.51 MeV/u) projectiles in the electronic stopping regime are discussed in the present work. Focusing on two classes of target materials such as oxides (SrTiO3, TiO2, Al2O3) and highly oriented pyrolytic graphit (HOPG), we present experimental data on (AFM, STM) track formation after irradiation at varying angle of incidence from 90∘ down to 0.3∘ . Especially at grazing angle of incidence, elongated chains of nanohillocks with lengths of about several hundred nanometers can be created. A statistical analysis of the track length and distance between the neighboring hillocks shows a strong dependence on the angle of incidence. Based on these experimental results a new approach describing the track formation could be developed.