@conference{
author = "Rymzhanov, Ruslan and O’Connell, Jacques and Medvedev, Nikita and Ćosić, Marko and Skuratov, Vladimir and Janse van Vuuren, Arno and Gorbunov, Sergey and Volkov, Alexander",
year = "2022",
abstract = "A combined Monte Carlo (MC) and Molecular Dynamics (MD) approach enables us to study in detail effects of different stages of swift heavy ion (SHI) track formation. The MC model (TREKIS [1]) describes excitation of the electronic system and energy transfer to the lattice providing initial conditions for the MD simulations of subsequent lattice response. We discuss here the kinetics of individual track formation, tracks overlap and surface modifications in some amorphizable (YAG, Mg2SiO4) and non-amorphizable (Al2O3, MgO, CaF2) solids irradiated with SHIs. High-resolution transmission electron microscopy analysis of samples irradiated with Xe and Bi ions is used to validate the developed model and to investigate the link between the basic properties of the studied materials and the kinetics of structural changes of the targets. We demonstrate the following: 1) The size and morphology of individual latent tracks and tracks overlap at high fluences are strongly affected by recrystallization of the transiently disordered zone [2]. 2) Different spectra of electrons generated by ions of different energies result in a velocity effect of track formation and a mismatch between the position of the maximal damage and the Bragg peak of the projectile energy loss [3]. 3) Protrusion of molten material and a final structure of surface defects induced by an SHI are governed by mobility of target atoms, surface tensions and recrystallization of a material during the ultra-short cooling period [4]. 4) A target thickness affects formation of surface defects under SHI irradiation: the thinnest layers form a through hole, semispherical and spherical hillocks are created after an ion impact at medium thicknesses, whereas nanoparticle emission occurs from thick layers [5]. 5) Impact of an SHI under a grazing incidence results in formation of a groove-like structure vs. a chain of nanohillocks depending on material and irradiation properties. It can be concluded that hydrodynamic (Rayleigh) instability of molten material on the surface dominates in hillock chain formation over the effect of the dependence of ion energy loss on the impact parameter.",
publisher = "Helsinki, Finland : University of Helsinki",
journal = "ICACS & SHIM 2022 : 29th International conference on atomic collisions in solids & 11th International symposium on swift heavy ions in matter : Book of abstracts",
title = "Comprehensive model of SHI impacts: from ion passage to track formation",
pages = "39-39",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12378"
}
