Microscopic Insights into the Sputtering of Thin Organic Films on Ag{111} Induced by C60 and Ga Bombardment

J. Phys. Chem. B, 109 (24), 11973 -11979, 2005. 10.1021/jp050821w S1089-5647(05)00821-7
Web Release Date: May 25, 2005

Microscopic Insights into the Sputtering of Thin Organic Films on Ag{111} Induced by C₆₀ and Ga Bombardment

Zbigniew Postawa,* Bartlomiej Czerwinski, Nicholas Winograd, and Barbara J. Garrison*

Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland, and Department of Chemistry, 104 Chemistry Building, The Pennsylvania State University, University Park, Pennsylvania 16802

Received: February 16, 2005

In Final Form: April 25, 2005

This paper contains enhanced objects available on the Internet at http://pubs.acs.org.

Abstract:

Molecular dynamics computer simulations have been employed to model the bombardment of Ag{111} covered with three layers of C₆H₆ by 15 keV Ga and C₆₀ projectiles. The study is aimed toward examining the mechanism by which molecules are desorbed from surfaces by energetic cluster ion beams and toward elucidating the differences between cluster bombardment and atom bombardment. The results show that the impact of the cluster on the benzene-covered surface leads to molecular desorption during the formation of a mesoscopic scale impact crater via a catapulting mechanism. Because of the high yield of C₆H₆ with both Ga and C₆₀, the yield enhancement is observed to be consistent with related experimental observations. Specific energy and angle distributions are shown to be associated with the catapult mechanism.

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