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Electronic sputtering: angular distributions of (LiF)nLi+ clusters emitted in collisions of Kr (10.1 MeV/u) with LiF single crystals

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Abstract

A combination of imaging techniques (XY) and time-of-flight (TOF) spectroscopy was used to measure the complete velocity vector of sputtered positive secondary ions in collisions of Kr33+ (10.1 MeV/u) with well prepared LiF single crystals in the electronic stopping regime. The angular distributions of (LiF) n Li+ clusters become broader with increasing cluster size n. This could be an indication of contributions from different ejection mechanisms. The experimental secondary ion angular distributions can be fitted by a simple cosine function of the type N(θ) = A cosm(θ), but it does not reproduce the shape of the jet-like structure observed for the emission of neutral LiF particles perpendicular to the ion beam. Therefore, the cluster emission hypothesis does not explain in a simple way the observed narrow jet.

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Authors and Affiliations

  1. Centre de Recherche sur les Ions, les Matériaux et la Photonique CIMAP-GANIL (CEA-CNRS-ENSICAEN-UCBN), BP 5133, Boulevard Henri Becquerel, 14070, Caen Cedex 05, France

    H. Hijazi, H. Rothard, P. Boduch, I. Alzaher, A. Cassimi, F. Ropars, T. Been, J. M. Ramillon, H. Lebius & B. Ban-d’Etat

  2. Physics Department, Universidade Federal de Santa Catarina, Campus Trindade, 88040-970, Florianópolis, Brazil

    L. S. Farenzena

  3. Physics Department, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marquês de São Vicente 225, Gávea, 22453-900, Rio de Janeiro, Brazil

    E. F. da Silveira

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  1. H. Hijazi
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  2. H. Rothard
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  3. P. Boduch
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  4. I. Alzaher
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  5. A. Cassimi
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  7. T. Been
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  8. J. M. Ramillon
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  10. B. Ban-d’Etat
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  11. L. S. Farenzena
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  12. E. F. da Silveira
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Correspondence to H. Rothard.

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Hijazi, H., Rothard, H., Boduch, P. et al. Electronic sputtering: angular distributions of (LiF)nLi+ clusters emitted in collisions of Kr (10.1 MeV/u) with LiF single crystals. Eur. Phys. J. D 66, 68 (2012). https://doi.org/10.1140/epjd/e2012-20545-3

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