Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Nanostructures at surfaces: Dots, particles, clusters
O 23.4: Vortrag
Dienstag, 23. März 2010, 11:15–11:30, H33
Spatial and temporal resolved microscopic processes in dielectrics irradiated with swift heavy ions — •Orkhan Osmani1,2, Nikita Medvedev2, Marika Schleberger1, and Baerbel Rethfeld2 — 1Universität Duisburg-Essen, Fakultät für Physik, Duisburg — 2Technische Universität Kaiserslautern, Fachbereich Physik, Kasierslautern
When an ion with kinetic energies of some 100 MeV irradiated a target insulator structural modifications can be observed on the surface. These modifications originate from strong localized electronic excitations induced by the penetrating ion. These excited electrons propagate through the crystal and excite secondary electrons on their path thus creating an electronic cascade. Such excited electrons will thermalize with the target lattice by exciting phonons. The heating of the target lattice will result finally in a molten zone that can be detected by AFM for instance. The aim of this presentation is to give an understanding of the processes involved during irradiation of dielectrics. To this end we study the excitation and relaxation of the electronic system and the creation of phonons theoretically applying classical kinetic Monte Carlo method and the two temperature model.