The loss of energy of hydrogen and deuterium ions having initial energies in the range from 60 to 340 kev has been measured as a function of their path in various gases at various pressures. The measurements are expressible in terms of the energy loss in kev per cm of path per mm of pressure as well as in terms of stopping power relative to air. The gases examined are air, water vapor, hydrogen, deuterium, and helium.
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Craig M. Crenshaw (1942) studied this question.