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A molecular dynamics computer simulation of the time dependence of surface damage production in ion irradiated metal targets

Webb, RP and Harrison, DE (1984) A molecular dynamics computer simulation of the time dependence of surface damage production in ion irradiated metal targets Vacuum, 34 (10-11). pp. 847-851.

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Abstract

Molecular dynamics computer simulations have been used to study the development of ion-induced cascades in the surface region of an initially perfect single crystal metal target. A 16 mm movie has been produced to show the temporal progress of individual cascades. The cascades can then be seen to be formed from a few high energy primary knock-on initiated replacement collision sequences which overlap to form the more usual interpretation of a mature collision cascade. However, it is before the collision cascade has matured, and while the replacement sequences are spreading, that the majority of atoms (>80%) are ejected. These qualitative observations are also upheld more quantitatively in a global average, over many cascades, of the ejection time of each atom. This gives rise to the appearance of a statistical ejection front which propagates radially outwards, from the impact point on the crystal surface, with a well defined velocity. © 1984.

Item Type: Article
Authors :
NameEmailORCID
Webb, RPr.webb@surrey.ac.ukUNSPECIFIED
Harrison, DEUNSPECIFIEDUNSPECIFIED
Date : 1 January 1984
Identification Number : https://doi.org/10.1016/0042-207X(84)90162-3
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:18
Last Modified : 17 May 2017 15:03
URI: http://epubs.surrey.ac.uk/id/eprint/834783

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