Regensburg 2010 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 31: Statistical Physics far from Equilibrium
DY 31.7: Talk
Friday, March 26, 2010, 12:00–12:15, H38
Molecular dynamics simulation of excitation and relaxation kinetics of ionic subsystem in swift heavy ion's track — •Vladimir Lipp1 and Alexander Volkov2 — 1Fachbereich Physik, Universität Kaiserslautern, Erwin-Schrödinger-Straße, D-67663 Kaiserslautern, Germany — 2Russian Research Centre Kurchatov Institute, Kurchatov Sq. 1, Moscow, 123182, Russia
Computer simulation of solid argon was performed to check the validity of the classical temperature diffusion approach for short-time kinetics in swift heavy ions (SHI) tracks. Cylindrical symmetry of the SHI track was assumed. The excitation was propagating from the center to surroundings of the system. The time which the system needs to reach local equilibrium was estimated by analyzing entropy behavior and by the comparison of local kinetic temperature and configuration temperature [1] at certain distances from the center of the SHI track. In addition, spatial-temporal propagation of the excitation was compared with that predicted by classical parabolic heat conduction equation.
[1] Powles, J. G., Rickayzen, G. and Heyes, D. M.(2005)'Temperatures: old, new and middle aged', Molecular, Physics,103:10,1361-1373.