https://doi.org/10.1140/epjd/e2007-00225-3
Dynamics of cluster deposition on Ar surface
1
Laboratoire de Physique Théorique, UMR 5152, Université P. Sabatier, 31062 Toulouse Cedex, France
2
Institut für Theoretische Physik, Universität Erlangen, Staudtstrasse 7, 91058 Erlangen, Germany
Corresponding author: a reinhard@theorie2.physik.uni-erlangen.de
Received:
1
February
2007
Revised:
25
May
2007
Published online:
29
June
2007
Using a combined quantum mechanical/classical method, we study the dynamics of deposition of small Na clusters on Ar(001) surface. We work out basic mechanisms by systematic variation of substrate activity, impact energy, cluster orientations, cluster sizes, and charges. The soft Ar material is found to serve as an extremely efficient shock absorber which provides cluster capture in a broad range of impact energies. Reflection is only observed in combination with destruction of the substrate. The kinetic energy of the impinging cluster is rapidly transfered at first impact. The distribution of the collision energy over the substrate proceeds very fast with velocity of sound. The full thermalization of ionic and atomic energies goes at a much slower pace with times of several ps. Charged clusters are found to have a much stronger interface interaction and thus get in significantly closer contact with the surface.
PACS: 36.40.Gk – Plasma and collective effects in clusters / 36.40.Mr – Spectroscopy and geometrical structure of clusters / 36.40.Sx – Diffusion and dynamics of clusters / 36.40.Vz – Optical properties of clusters
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007