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Charge state of C10 and C5 energetic cluster ions in amorphous carbon targets: simulations

Nardi, E. and Tombrello, T. A. (2006) Charge state of C10 and C5 energetic cluster ions in amorphous carbon targets: simulations. Journal of Physics: Condensed Matter, 18 (49). pp. 11357-11370. ISSN 0953-8984. http://resolver.caltech.edu/CaltechAUTHORS:NARjpcm06

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Abstract

We present here detailed simulations of the interaction of energetic C10 and C5 clusters at the energies of 1, 2, and 4 MeV per carbon atom with an amorphous carbon target. The spatial evolution of the cluster components is simulated accounting for both scattering and Coulomb explosion. The former is calculated by means of the Monte Carlo method while the latter is computed by means of molecular dynamics. The charge state of the individual cluster components is calculated as a function of penetration depth, and is determined by the competition between electron ionization and recombination. The results of calculations of the effect of the neighbouring cluster components on the suppression of the values of the charge state are presented and compared to the experimental values of Brunelle et al. Charge state suppression calculations for the 2 MeV/C clusters for both C10 and C5 agree well with the experimental results for penetration depths of less than about 500 and 250 Å respectively, assuming the intracluster Coulomb potential is screened by four target valence electrons. At 4 MeV/C the results are similar although less screening is required; a possible explanation is the inability of the plasma to completely screen the higher velocity projectiles. The 1 MeV/C calculated results however differ in their behaviour from the 2 and 4 MeV/C cases.


Item Type:Article
Additional Information:Copyright © Institute of Physics and IOP Publishing Limited 2006. Received 23 August 2006, in final form 2 November 2006. Published 23 November 2006. Print publication: Issue 49 (13 December 2006) This work was partially supported by the German–Israeli Project Cooperation Foundation (DIP) and the Israel Science Foundation. The authors would also like Professor N Arista for his valuable comments. [This article was chosen for inclusion in IoP Select <http://www.iop.org/Select/>. Articles are accessible via the Select service for 365 days and are available to all readers FREE OF CHARGE. IOP Select: A FREE service from IOP Journals comprising articles chosen by our Editors for their novelty, significance and potential impact on future research.]
Record Number:CaltechAUTHORS:NARjpcm06
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:NARjpcm06
Alternative URL:http://dx.doi.org/10.1088/0953-8984/18/49/026
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6291
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:01 Dec 2006
Last Modified:26 Dec 2012 09:19

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