Interplay between the Coulomb explosion and vicinage effects studied using H molecules under channeling conditions

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R. C. Fadanelli, P. L. Grande, M. Behar, and J. F. Dias
Instituto de Física, Federal University of Rio Grande do Sul, Avenida Bento Gonçalves, 9500, CEP 91501-970 Porto Alegre (RS), Brazil

K. Czerski
Institute of Physics, University of Szczecin, Szczecin, Poland

G. Schiwietz
Hahn-Meitner Institut, Abteilung SF4, Glienicker Strasse 100, D-14109 Berlin, Germany

Received 7 December 2005; revised 12 May 2006; published 29 June 2006

Theaim of this work is to investigate how the meanenergy loss and straggling due to H <sub>2</sub><sup>+</sup> molecules interacting withsilicon are affected by the Coulomb explosion and vicinage effects.To that end, a SIMOX-type sample made up of ¹⁸Oand with an appropriate ¹⁸O marker grown over the surfaceof crystalline Si was employed, allowing to carry out themeasurements through the ¹⁸O(p, alpha )¹⁵N resonant reaction at 151.2 keV under channelingand random directions. The results show that the mean energyloss associated with the Coulomb explosion and vicinage effects aresimilar and amount each to about 2% of the totalmean energy loss. The comparison of the energy straggling obtainedfor molecular beams at random and the well-aligned 100 directionshows a larger value for the aligned case, which isinterpreted as a result of the Coulomb explosion along thechannel direction. The experimental results are also discussed in termsof Monte Carlo simulations.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.73.245336
DOI:	10.1103/PhysRevB.73.245336
PACS:	68.55.Ln; 34.50.Bw; 61.85.+p; 36.40.-c 68.55.Ln Thin film defects and impurities including doping, implantation, distribution, concentration, etc 34.50.Bw Energy loss and stopping power (atoms and molecules) 61.85.+p Channeling phenomena including blocking, energy loss, etc 36.40.-c Atomic and molecular clusters YEAR: 2006
KEYWORDS:	silicon, Monte Carlo methods, elemental semiconductors, molecular beams, energy loss of particles, channelling

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