Proton Energy-Loss Distributions from Thin Carbon Films

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Abstract
A 992-keV proton beam, limited in energy spread by a 1-m electrostatic analyzer, passes through a thin carbon film before entering a second 1-m electrostatic analyzer. The energy distribution of protons in the second analyzer is measured by sorting proton counts from a detector at the analyzer exit according to the instantaneous value of a sweep voltage applied to one of the analyzer plates. A combined resolution of 30 000 was obtained for the double-analyzer system. Carbon films with thicknesses corresponding to mean energy losses ranging from several keV down to about 200 eV have been studied. Several of the experimental energy-loss distributions are compared with distributions computed by Monte Carlo techniques for three different assumed discrete energy-loss spectra. Good fits are obtained from a new spectrum constructed using the results of some computations by E. Merzbacher.

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