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# A Measurement of the Average Energy Required to Create an Ion Pair in Nitrogen by High-Energy Ions

Ralph H. Thomas, John T. Lyman and Theodore M. de Castro
Vol. 82, No. 1 (Apr., 1980), pp. 1-12
DOI: 10.2307/3575232
Stable URL: http://www.jstor.org/stable/3575232
Page Count: 12
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## Abstract

At energies above ∼ 10 MeV/amu, it is expected that the average energy required to create an ion pair, w̄, in gases will be independent of mass or charge state of the ion and with increasing energy will tend toward the value for electrons, which in nitrogen is 34.6 eV. Twenty-two measurements of w̄ using 250 MeV/amu ${}^{12}{\rm C}{}^{6+}$ ions, 375 MeV/amu ${}^{20}{\rm Ne}{}^{10+}$ ions, and 479 MeV/amu ${}^{40}{\rm Ar}{}^{18+}$ ions were made and values of 36.4 ± 0.6, 35.4 ± 0.8, and 34.7 ± 0.5 eV, respectively, were obtained for nitrogen gas.

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