Hannover 2003 – wissenschaftliches Programm
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MO: Molekülphysik
MO 13: Grosse molekulare Cluster und Fullerene
MO 13.6: Vortrag
Freitag, 28. März 2003, 12:45–13:00, B 305
Anisotropic fragmentation and micro-solvation in cluster-surface collisions — •Anna Tomsic, Hartmut Schröder, Karl-Ludwig Kompa, and Christoph R. Gebhardt — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, D-85748 Garching, Germany
The fragmentation dynamics of (H2O)1032 colliding with a repulsive surface at two incident velocities have been examined in a classical molecular dynamics simulations study. The results show a large anisotropy in the energy distribution inside the cluster upon impact, which leads to asymmetric fragmentation, starting in the lower-outer part of the cluster. The low-mass region of the size distribution can be described by a power law with an exponent close to −2, and the range of this region increases with increasing incident velocity. The formed fragments have rather uniform internal temperatures close to the standard boiling point of water, but the translational temperature of the monomers formed upon collision is much larger, pointing at the anisotropic energy distribution inside the cluster. For the investigated conditions, the dynamics are insensitive to the initial structure of the cluster. The introduction of an ion to the center of the cluster allows for the study of micro-solvation effects, e.g. ligand exchange processes, during the collision.