Eur. Phys. J. D 24, 315-318 (2003)
https://doi.org/10.1140/epjd/e2003-00155-0

Large-scale molecular dynamics simulations of high energy cluster impact on a diamond surface

2nd report: Impact-induced crater and shockwave

¹ Department of Mechanophysics Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
² Institut für Mikrostrukturtechnik, Universität und Forschungszentrum Karlsruhe, Postfach 3640, 76021 Karlsruhe, Germany

Corresponding author: ^a yamaguchi@mech.eng.osaka-u.ac.jp

Received: 10 September 2002
Published online: 3 July 2003

Abstract

Large-scale molecular dynamics simulations of high acceleration energy single cluster impacts on a diamond surface are performed in order to investigate the cluster surface interaction. The formation of the crater and of the multiple shockwaves at a cluster acceleration energy E_a=100 keV is studied in detail in this report. The two Ar₉₆₁ impact simulations using and not using external symmetric region do not show any clear difference, so that the unspherical crater structure at the very beginning of the impact and the shockwave propagation directions do not result from the respective outer region representation but from the effect of the crystal structure of diamond. The impact simulation of a virtual hard spherical cluster demonstrates a deeper transient crater as well as a more pronounced final impact morphology while the impact-induced multi-layered shockwaves resemble those seen in the case of the normal cluster impact.