München 2004 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

MO: Molekülphysik

MO 17: Poster II

MO 17.8: Poster

Thursday, March 25, 2004, 14:00–16:00, Schellingstr. 3

Cluster impact dynamics — •Anna Tomsic and Christoph Gebhardt — Max-Planck-Institut für Quantenoptik

We present results from classical molecular dynamics simulations of the impact of clusters of SO₂ and H₂O on rigid model surfaces. The clusters consist of 10³ molecules and collide with the surface at a wide range of impact velocities. The degree of fragmentation, the internal temperature of the final fragments and the characteristics of the monomer emission can efficiently be described by scaling parameters related to the binding energy of the cluster and the impact velocity. To study the effect of the presence of a charged particle on the outcome of the collision, a Na⁺ ion was introduced to the center of impacting water clusters. The ion typically acts as a spectator to the collision and ends up in one of the largest surviving cluster fragments. The immediate environment of the ion inside the cluster was examined, and we found that its ligand shell is rapidly exchanged during the collision by a combination of impact-induced removal of ligands and diffusion.