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5. Theoretical Physics (CSN4)

The rainbow ion-solid interaction potential

by Srdan Petrović (Vinca Inst. of Nuclear Inst.)

Aula Seminari (LNF)

Aula Seminari


Via Enrico Fermi, 40 00044 Frascati (Roma)
This talk will be devoted to the rainbow proton-silicon interaction potential. We show that it can be obtained as a modification of the corresponding Molière proton-silicon interaction potential by applying the theory of crystal rainbows [1] and the experimental high-resolution angular pattern of 2 MeV protons transmitted through a 55 nm thick <100> Si crystal [2]. The fitting procedure has been performed so that the peripheral rainbow line, generated by the corresponding ZBL interaction potential [3], and the central rainbow line, generated by the Molière interaction potential used by Krause et al. [4], were at the same time well approximated by the rainbow lines generated by the rainbow interaction potential. As a result, the theoretical angular distributions of transmitted protons are in excellent agreement with the corresponding experimental ones. Possible applications of the rainbow ion–atom interaction potential has been discussed. [1] S. Petrović, L. Miletić, and N. Nešković, Theory of rainbows in thin crystals: The explanation of ion channeling applied to Ne10+ ions transmitted through a <100> thin crystal, Phys. Rev. B 61, 184 (2000). [2] M. Motapothula, S. Petrović, N. Nešković, Z. Y. Dang, M. B. H. Breese, M. A. Rana, and A. Osman, Origin of ringlike angular distributions observed in rainbow channeling in ultrathin crystals, Phys. Rev. B 86, 205426 (2012). [3] J. F. Ziegler, J. P. Biersack and U. Littmark, The stopping and range of ions in solids (Pergamon Press, 1985). [4] H. F. Krause, J. H. Barrett, S. Datz, P. F. Dittner, N. L. Jones, J. Gomez del Campo, and C. R. Vane, Angular distribution of ions axially channeled in a very thin crystal: Experimental and theoretical results, Phys. Rev. A 49, 283 (1994).