Catastrophic planar dechanneling in strained-layer superlattices

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5298100

Chu, W K; Allen, W R; Ellison, J A; Picraux, S T

Recently a catastrophic dechanneling effect has been discovered to occur when the wavelength of a planar-channeled ion beam matches the layer period of a strained-layer superlattice (SLS). We report continuum model calculations of planar channeled trajectories in strained-layer superlattices to obtain the depth dependence of the dechanneling due to the SLS structure for various incident angles. The calculations are in good agreement with the dechanneling measurements. In addition, features of the dechanneling versus depth calculation are found to be quite sensitive to the continuum potential near the planes and these features are experimentally resolvable. This work not only provides for the measurement of lattice strain in superlattices, but also enhances our understanding of planar channeling and suggests a new method for comparing the accuracy of various scattering potentials. 10 refs., 5 figs.

• Research Organization: North Carolina Univ., Chapel Hill (USA). Dept. of Physics and Astronomy; New Mexico Univ., Albuquerque (USA). Dept. of Mathematics; Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5298100
• Report Number(s): SAND-85-0618C; ON: DE85017160
• Country of Publication: United States
• Language: English

Related Subjects

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654001 -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
CHANNELING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DISTRIBUTION
FOCUSING
ION CHANNELING
RESONANCE
STABILITY
STRAINS
TRAJECTORIES