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The absolute values of W, the energy required to produce one ion pair, for electrons have been determined for several gases. A parallel plate extrapolation ionization chamber in conjunction with a ferrous sulfate dosimeter was used. The gases investigated were air, nitrogen, oxygen, carbon dioxide, argon, methane, and ethylene; and the absolute values of W were 33.9, 34.8, 30.9, 32.6, 25.5, 26.8, and 26.3 ev, respectively.
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Weiss et al. (1955) studied this question.
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