The Ionization of Helium, Neon, and Argon by Electron Impact
1930; American Institute of Physics; Volume: 36; Issue: 8 Linguagem: Inglês
10.1103/physrev.36.1293
ISSN1536-6065
Autores Tópico(s)Mass Spectrometry Techniques and Applications
ResumoQuantitative measurements have been made of the total number of positive charges produced per electron per cm path at a definite pressure, in helium, neon, and argon, as a function of the energy of the impacting electrons out to 4500 volts. In helium the maximum efficiency 1.256 occurs at 110 volts, in neon 3.008 at 170 volts, and in argon 13.01 at 88 volts.An empirical relation has been found which expresses the efficiency of ionization of helium within the experimental error for energies greater than 60 volts.The data obtained differ considerably from that found by previous investigations, but because of the more precise length of path from which the positive ions were measured and the more accurate knowledge of the energy of the electrons as well as the elimination of secondary electrons, it is believed that the results presented here are the most accurate thus far obtained.
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