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Simulation Studies of Collision Cascades in Liquid in Targets

Published online by Cambridge University Press:  28 February 2011

D. Y. Loi ,
M. H. Shapiro ,
T. A. Tombrello ,
B. J. Garrison  and
N. Winograd
D. Y. Loi
Affiliation:
Division of Physics, Mathematics and Astronomy, Caltech, Pasadena, CA 91125, U.S.A.
M. H. Shapiro
Affiliation:
Physics Dept., California State University, Fullerton, CA 92634, U.S.A. and Division of Physics, Mathematics and Astronomy, Caltech, Pasadena, CA 91125, U.S.A.
T. A. Tombrello
Affiliation:
Division of Physics, Mathematics and Astronomy, Caltech, Pasadena, CA 91125, U.S.A.
B. J. Garrison
Affiliation:
Chemistry Dept., Pennsylvania State University, University Park, PA 16802, U.S.A.
N. Winograd
Affiliation:
Chemistry Dept., Pennsylvania State University, University Park, PA 16802, U.S.A.
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Abstract

Multiple interaction computer simulations have been used to determine the properties of collision cascades in liquid In targets induced by normally incident 5 keV Ar+ ions. Below the first atomic layer the cascade becomes Thompson-like relatively quickly. However, within the first atomic layer the angular distribution of moving atoms became forward peaked by 150 fs and remained so until,∼300 fs. Energy and angle resolved (EARN) spectra were calculated for the ejected atoms. The peak of the energy distribution shifted to lower energies at larger ejection angles, and the angular distributions became broader for lower energy particles. Both results agree with recent experimental data, and with a simple model proposed bg Garrison. Our results suggest that the detailed structure of the surface layer is very important in the sputtering process.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 74: Symposium A – Beam-Solid Interactions and Transient Processes , 1986 , 449
Copyright
Copyright © Materials Research Society 1987

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