Postawa Zbigniew, Czerwinski Bartlomiej, Winograd Nicholas, Garrison Barbara J
Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland.
J Phys Chem B. 2005 Jun 23;109(24):11973-9. doi: 10.1021/jp050821w.
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.
分子动力学计算机模拟已被用于对覆盖有三层苯（C6H6）的银（Ag）{111}表面，受到15 keV的镓（Ga）离子和富勒烯（C60）弹丸轰击的过程进行建模。该研究旨在探究分子通过高能团簇离子束从表面解吸的机制，并阐明团簇轰击与原子轰击之间的差异。结果表明，团簇对苯覆盖表面的撞击，通过弹射机制在形成介观尺度撞击坑的过程中导致分子解吸。由于镓离子和富勒烯弹丸都具有较高的苯解吸产率，因此观察到的产率增强与相关实验观测结果一致。特定的能量和角度分布被证明与弹射机制有关。
