Angular distributions of ions channeled in the LT 1 0 0 GT Si crystals
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In this study we analyze the angular distributions of Ne10+ ions channeled in the LT 100 GT Si crystals. The ion energy is 60 MeV and the crystal thickness is varied from 286 to 3435 nm. This thickness range corresponds to the reduced crystal thickness range from 0.5 to 6, i.e. from the second to the twelfth rainbow cycle. The angular distributions were obtained via the numerical solution of the ion equations of motion and the computer simulation method. The analysis shows that the angular distribution has a periodic behavior. We also analyze the transmission patterns corresponding to the angular distributions. These patterns should be compared to the experimental patterns obtainable by a two-dimensional position sensitive detector. We demonstrate that, when the ion beam divergence is sufficiently large, i.e. much larger than the critical angle for channeling, the channeling star effect occurs in the transmission patterns. (C) 2002 Elsevier Science B.V. All rights reserved.
Source:Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 2002, 193, 152-159
- 19th International Conference on Atomic Collisions in Solids, Jul 29-Aug 03, 2001, Paris, France