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A proportional counter designed as a detector of ions and neutral atoms for use in collision experiments at kiloelectron volt energies is described. Response to 1–40 keV H+ ions and 5–40 keV Ar+ and N+ ions is investigated. Particles enter the detector from an attached evacuated chamber through a thin film covered narrow slit or through a differentially pumped open aperture. Construction of the counter and performance with both types of aperture are described. Performance is evaluated in terms of two statistical measures of the differential pulse height distribution—the most probable pulse height and the pulse height spread. Sufficient data are given to permit evaluation of the proportional counter as an ion energy spectrometer. Measurements of scattering and energy loss of protons in the thin film window are described.
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McClure et al. (1966) studied this question.
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