Origin of ringlike angular distributions observed in rainbow channeling in ultrathin crystals
Petrović, Srđan M.
Nešković, Nebojša B.
Dang, Z. Y.
Breese, M. B. H.
Rana, M. A.
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Using the theory of crystal rainbows, we prove that the well-known doughnut patterns observed in ion channeling in thin crystal membranes are manifestations of the rainbow effect. This is done by a detailed morphological study of the high-resolution experimental angular distributions of 2 MeV protons channeled in a 55-nm-thick (001) silicon crystal tilted away from the  direction. The inner side of the doughnut is the dark side of the rainbow, analogous to the Alexanders dark band, occurring between the primary and secondary meteorological rainbows.
Source:Physical Review B: Condensed Matter and Materials Physics, 2012, 86, 20
- Physics and Chemistry with Ion Beams (RS-45006)