Abstract
A modified version of the multiple-interaction code SPUT2 has been used to simulate impacts of 63-atom Cu clusters on six-layer Cu targets. Simulations were carried out with cutoff times of 100 and 500 fs for an incident cluster energy of 63 keY (1 keV/atom). Significant enhancements were observed in the maximum potential and kinetic energies achieved in the early phase of the collision cascade. Some hard collisions yielded atoms with potential energies as high as 925 eV (in the CM frame). This is almost twice the energy allowed in an isolated two-body collision. The number of hard collisions per time-step vs potential energy is well-fitted with a decaying exponential, allowing extrapolation to higher energies. These results together with similar results for Al clusters impacting Au targets suggest that non-linear collisional effects cannot explain the high D-D fusion rates seen in Beuhler, Friedlander, and Friedman’s recent experiment [1].
Similar content being viewed by others
References
R.J. Beuhler, G. Friedlander, and L. Friedman, Phys. Rev. Lett. 63, 1292 (1989).
R. Beuhler and L. Friedman, Chem. Rev. 86, 521 (1986).
P. Sigmund, J. de Physique C2, 175 (1989).
M.W. Matthew, R.J. Beuhler, M. Ledbetter, and L. Friedman, J. Phys. Chem. 90, 251 (1986).
M.W. Matthew, R.J. Beuhler, M. Ledbetter, and L. Friedman, Nucl. Inst. and Methods B14, 448 (1986).
P.R.W. Henkes and R. Klingelhofer, J. de Physique C2, 159 (1989).
M.H. Shapiro and T.A. Tombrello, Caltech preprint BB-94, (1990), submitted to Phys. Rev. Lett.
P.M. Echenique, J.R. Manson, and R.H. Ritchie, Phys. Rev. Lett. 64, 1413 (1990).
D.E. Harrison, Jr., Crit. Rev. in Solid State and Mat. Sci. 14, S1 (1988).
R. Berisch, ed., Sputtering by Particle Bombardment. Vol. 1, (Springer-Verlag, Basel, 1981).
M.H. Shapiro, T.A. Tombrello, and D.E. Harrison, Jr., Nucl. Inst. and Meth. B30, 152 (1988).
M.H. Shapiro, D.Y. Lo, P.K. Haff, and T.A. Tombrello, Nucl. Inst. and Meth. B13, 348 (1986).
R.A. Brizzolara, C.B. Cooper, and T.K. Olson, Nucl. Inst. and Meth. B35, 36 (1988).
Author information
Authors and Affiliations
Additional information
[Supported in part by NSF grant DMR86-15641]
Rights and permissions
About this article
Cite this article
Shapiro, M.H., Tombrello, T.A. Molecular Dynamics Simulations of Cluster Impacts on Metallic Targets. MRS Online Proceedings Library 193, 319–324 (1990). https://doi.org/10.1557/PROC-193-319
Published:
Issue Date:
DOI: https://doi.org/10.1557/PROC-193-319