Rainbow effect in axial ion channeling

Journal Article · Thu May 01 00:00:00 EDT 1986 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.33.6036· OSTI ID:5871313

Krause, H F; Datz, S; Dittner, P F; Gomez del Campo, J; Miller, P D; Moak, C D; Nekovic, N; Pepmiller, P L

We have studied the angular scattering distributions produced in axial channeling when incident protons (7 MeV) are well aligned to the axial direction of a thin silicon crystal (1400 A). Measured angular distributions obtained in the <100> and <110> directions using a two-dimensional (2D) position-sensitive detector (resolution < or approx. =0.015/sup 0/) have been interpreted by comparison with Monte Carlo trajectory calculations for these channels in the momentum approximation. The measured angular distributions show structures at certain off-axis angles which are in good agreement with the calculations. The general shape and structure in the angular contour map for a given channel have been shown to be a consequence of extrema in the 2D classical deflection functions for the two Cartesian scattering angles in the detection plane. The occurrence of the extrema in a very thin crystal (i.e., a rainbow effect in axial channeling) is a consequence of the channeling geometry when atomic strings surrounding the axial channel interact with the projectile simultaneously.

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5871313
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 33:9
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
SILICON
PROTON CHANNELING
ANGULAR DISTRIBUTION
AXIAL SYMMETRY
CRYSTALS
FINE STRUCTURE
MEV RANGE 01-10
CHANNELING
DISTRIBUTION
ELEMENTS
ENERGY RANGE
MEV RANGE
SEMIMETALS
SYMMETRY
654001* - Radiation &amp; Shielding Physics- Radiation Physics
Shielding Calculations &amp; Experiments