Web Release Date: June 20,
Quadratic Friction Model for Cluster Bombardment of Molecular Solids
and
104 Chemistry Building, Department of Chemistry, Penn State University, University Park, Pennsylvania 16802, and Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland
Received: March 22, 2007
In Final Form: May 25, 2007
Abstract:
Molecular dynamics simulations of energetic cluster bombardment (C20, C60, C120, C180) are performed in the range of 5-20 keV on a solid benzene substrate. The goal is to study the trends exhibited by these bombardment events and to develop a simple analytical model that explains the general dynamics associated with cluster projectiles. These results indicate that the dynamics of these clusters can be described by a macroscale quadratic friction model and thus can provide an interpretation for the dependencies on cluster mass and size, as well as the observation that velocity of the cluster relative to its initial value decays exponentially with time with a decay constant that linearly depends on the initial velocity.
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