Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1686448 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2006 | 4 Pages |
Abstract
Flux redistribution with formation of channeling peaks were recently observed in transmission experiments done with a variety of ion-crystal combinations. This phenomenon was called a cooling effect and was observed to be function of the ion-target combination, the incident energy and even the crystallographic direction. In the present work we have looked for the same phenomena with a completely different experimental approach. With this aim we have used the Rutherford backscattering technique under channeling conditions and a SIMOX target. By performing He in Siã1 0 0ã channeling experiments we were able to determine the electronic stopping powers between +2° and â2° around the ã1 0 0ã direction in a 600-2000 keV energy range. With this information and the Lindhard's angular compensation rule, we were able to deduce the characteristics of the He flux as a function of the energy. We found that between 600 and 1500 keV we are in presence of a cooling effect. However, at around 2000 keV, according to the Lindhard's rule, the He flux distribution approaches to a normal behavior.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
F. Bernardi, L.L. Araújo, M. Behar, J.F. Dias,