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DS: Fachverband Dünne Schichten

DS 49: Ion Interactions with Nano Scale Materials IV (Focused Session -- Organisers: Diesing, Facsko)

DS 49.4: Vortrag

Donnerstag, 17. März 2011, 18:45–19:00, GER 37

Temporally resolved track creation in dielectrics after swift heavy ion irradiation. Part I: Monte-Carlo simulation — •Nikita Medvedev^1,2, Orkhan Osmani^1,3, Marika Schleberger³, and Baerbel Rethfeld¹ — ¹Technical University of Kaiserslautern, Germany — ²CFEL at DESY, Hamburg, Germany — ³University of Duisburg-Essen, Germany

The dynamics of structural modifications of dielectrics irradiated with swift heavy ions (SHI, with energies E > 1 MeV/u and masses M > 20 proton mass) are investigated theoretically. We developed a combination of Monte-Carlo method (MC), used to describe SHI penetration and following excitation and relaxation of the electronic subsystem, with Two Temperature Model (TTM) describing the heating of the lattice [1,2].

In part I of this report we describe the MC method and its main results: the thermalization time of electrons in track, the distribution of energies of electrons, holes, and lattice. That gives a physical background, limits of validity, initial conditions and parameters necessary for the subsequent TTM calculations, presented in the part II.

[1] N.Medvedev, A.E.Volkov, N.Stcheblanov, B.Rethfeld, Phys. Rev. B 82, 125425 (2010)

[2] N.Medvedev, O.Osmani, B.Rethfeld, M.Schleberger, Nucl. Instrum. and Meth. B 268, 3160 (2010)