Zero-degree focusing of channeled ions and crystal rainbows
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We analyze here theoretically the connection between the effect of zero-degree focusing of channeled ions and the crystal rainbow effect. The calculations were performed for Ne10+ ions and a LT 100 GT Si thin crystal. The ion energy was 60 MeV and the crystal thickness was varied between 630 and 750 atomic layers. These conditions correspond to the neighborhood of the first maximum of the zero-degree yield of the channeled ions. The obtained results show that the effect of zero-degree focusing is influenced strongly by the crystal rainbow effect. (C) 2001 Elsevier Science B.V. All rights reserved.