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Molecular Dynamics Simulation of Fullerene Cluster Ion Impact

Published online by Cambridge University Press:  10 February 2011

Takaaki Aoki ,
Toshio Seki ,
Masahiro Tanomura ,
Jiro Matsuo ,
Zinetulla Insepov  and
Isao Yamada
Takaaki Aoki
Affiliation:
Ion Beam Engineering Experimental Laboratory, Kyoto University, Sakyo Kyoto 606-01 Japan, t-aoki@kuee.kyoto-u.ac.jp
Toshio Seki
Affiliation:
Ion Beam Engineering Experimental Laboratory, Kyoto University, Sakyo Kyoto 606-01 Japan, t-aoki@kuee.kyoto-u.ac.jp
Masahiro Tanomura
Affiliation:
Ion Beam Engineering Experimental Laboratory, Kyoto University, Sakyo Kyoto 606-01 Japan, t-aoki@kuee.kyoto-u.ac.jp
Jiro Matsuo
Affiliation:
Ion Beam Engineering Experimental Laboratory, Kyoto University, Sakyo Kyoto 606-01 Japan, t-aoki@kuee.kyoto-u.ac.jp
Zinetulla Insepov
Affiliation:
Ion Beam Engineering Experimental Laboratory, Kyoto University, Sakyo Kyoto 606-01 Japan, t-aoki@kuee.kyoto-u.ac.jp
Isao Yamada
Affiliation:
Ion Beam Engineering Experimental Laboratory, Kyoto University, Sakyo Kyoto 606-01 Japan, t-aoki@kuee.kyoto-u.ac.jp
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Abstract

In order to interpret the projection range and to reveal the mechanism of damage formation by cluster ion impact, molecular dynamics simulations of a fullerene carbon cluster (C60) impacting on diamond (001) surfaces were performed. When the kinetic energy of C60 is as low as 200eV/atom, C60 implants into the substrate deeper than a monomer ion with the same energy per atom because of the clearing-way effect. The kinetic energy of the cluster disperses isotropically because of the multiple-collision effect, and then a large hemispherical damage region is formed. When the energy of the cluster is as high as 2keV/atom, the cluster dissociates in the substrate, and then cascade damage is formed like in a case of a monomer ion impact. The projection range of incident atoms becomes similar to that of the monomer with the same energy per atom. However, the number of displacements of C60 is larger than the summation of 60 monomer carbons. The displacement yield of fullerene is 4 to 7 times higher than that of monomer carbon. This result agrees with the measurement of the displacements made on sapphire substrates with C60 and C2 irradiation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 504: Symposium KK – Atomistic Mechanisms in Beam Synthesis & Irradiation… , 1997 , 81
Copyright
Copyright © Materials Research Society 1998

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References

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