Abstract
Precise measurements are reported of critical channeling angles and minimum yields for light ions backscattered from good-quality natural diamond crystals under various conditions of temperature and energy. A comparison with the theoretical predictions of Barrett and others reveals excellent agreement, despite the fact that diamond represents an extreme case (the ratio of the thermal vibration amplitude at ordinary temperatures to the Thomas-Fermi screening distance is unusually small). The minimum yield as a function of depth is found to scale with energy according to the electronic stopping power. Theoretical calculations based on the diffusion model with initial transverse energy distributions calculated from a multistring continuum model give good agreement with experiment.
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