Strong oscillations in the Rutherford-backscattering yield of energetic ⁴He ions channeling in the basal plane of a beryllium single crystal have been observed. The wavelength of the oscillation is in reasonable agreement with a particle trajectory calculation using an analytical continuum potential, including the effects of thermal lattice vibrations, and is in good agreement with expectations from Monte Carlo simulations by Barrett.
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E. N. Kaufmann (1978) studied this question.