Scattering Effects with Channeled Ions

The angular distribution F(α) is calculated for fast ions that have traversed a lattice channel with an axis in the direction α = 0. For both axial and planar transmission channeling, intensity maxima are expected at {article}{empty}{document}|α ₘₐₓ | = α ₀ √(1 - η ᵗ)/(1 - η ˡ){document} , where α0 is the angle of incidence, and ηt and ηl denote the relative energy loss of transverse and longitudinal motion. The scattering effects provide a direct method to measure separately longitudinal and transverse stopping powers for channeled ions.