Abstract
Energy spectra of 0.5-MeV protons specularly reflected from a SnTe(001) surface are measured with a high-resolution magnetic spectrometer ( ΔE E ∼ 0.1% ). Position-dependent energy loss straggling is derived from the observed energy distributions of the reflected protons. The obtained position-dependent straggling is compared with the theoretical ones caused by plasmon excitations and single electron collisions. The agreement between the experimental and theoretical results is reasonably good. Contrary to the energy loss itself, contribution of the single electron collisions is dominant for the energy loss straggling.
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