Bouneau, S. and Della Negra, S. and Jacquet, D. and Le Beyec, Y. and Pautrat, M. and Shapiro, M. H. and Tombrello, T. A. (2005) Measurement of energy and angular distributions of secondary ions in the sputtering of gold by swift Aun clusters: Study of emission mechanisms. Physical Review B, 71 (17). Art. no. 174110. ISSN 1098-0121. http://resolver.caltech.edu/CaltechAUTHORS:BOUprb05
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Energy and angular distributions of negative ions (Au–, Au<sub>2</sub><sup>-</sup>, Au<sub>3</sub><sup>-</sup>, and Au<sub>5</sub><sup>-</sup>) emitted from gold target bombarded by Au, Au4, and Au9 projectiles at 200 keV/atom were measured with a multipixel position sensitive detector. The angular distributions are symmetrical with respect to the normal to the target surface and forward peaked. They depend on the type of emitted ions, on the emission energy, and on the projectile size. More forward directed emission is observed with Au9 projectiles. The secondary ion energy distributions obtained with Au and Au4 projectiles are well reproduced by a sum of linear collision cascades and thermal spike processes. However, in the case of Au9 projectiles the energy distributions are better described by using a simple spike model with two different average temperature regimes: the first one corresponds to high emission energy occurring in the early stage of the whole process, and the second to the low energy component.
|Additional Information:||©2005 The American Physical Society (Received 18 October 2004; revised 31 January 2005; published 24 May 2005) The authors are very grateful to L. Donadille for his precious help in performing the data analysis and for fruitful discussions. They would like also to thank L. Tassan-Got for his help and constant support. The involvement of A. Novikov in the experiments performed at the Tandem Accelerator at Orsay is greatly acknowledged.|
|Subject Keywords:||gold; metal clusters; sputtering; secondary ion emission; atom-surface impact|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||13 Jan 2006|
|Last Modified:||26 Dec 2012 08:44|
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