. Ionization and resonance potentials of some nonmetallic elements. he Lenard method, and theradiation effect is imdoubtedly what was observed. Akesson observed inelastic impact at seven volts. In oiu- experiments with oxygen the gas was generated electro-lytically and dried as before. Pressures ranging from i mm mm were used. Lyman, The spectroscopy of the extreme ultraviolet, p. 113. Loo. cit. 85s8°-2o 2 684 Scientific Papers of the Bureau of Standards [Vol. i6 The phenomena of electron currents in oxygen are quite differentfrom nitrogen though the critical potentials are in the same r
. Ionization and resonance potentials of some nonmetallic elements. he Lenard method, and theradiation effect is imdoubtedly what was observed. Akesson observed inelastic impact at seven volts. In oiu- experiments with oxygen the gas was generated electro-lytically and dried as before. Pressures ranging from i mm mm were used. Lyman, The spectroscopy of the extreme ultraviolet, p. 113. Loo. cit. 85s8°-2o 2 684 Scientific Papers of the Bureau of Standards [Vol. i6 The phenomena of electron currents in oxygen are quite differentfrom nitrogen though the critical potentials are in the same radiation effect is very small and the point at which it startsdifficult to determine, though the points of inelastic collision arenearly as sharp as in Arcing above the ionization poten-tial was not observed in the entire range of pressures that could beused, and no visible glow was observed in the vacuum , the ionization potential was very distinct in contrast tothe radiation effect and of a magnitude comparable to the electron. 5 10 Vo/ta acce/erQtih9 Fig. 8.—Current-voltage curves for oxygen cmrent. The measurements of critical potentials were thereforemade as with the vapors, viz, by obtaining two consecutive plate-current voltage curves by method i, one with Fg small, showingpoints of inelastic impact, and one with V2 large, showing ioniza-tion, and by measuring from the two the resonance potential andthe difference between the ionization and resonance potentials. Table 5 gives a summary of the conditions of measurement andanalysis of all the ciu^es. Fig. 8 gives typical curves. Theaccuracy attained with oxygen is probably slightly higher thanwith nitrogen on accoiuit of the absence of arcing effects. F^tT^ Ionization and Resonance Potentials 685 The final values are as follows: Volts Resonance potential ^ Ionization potential ± .5 The resonance potential gives by the quantum relation X = 1560A for the single-line spectrum
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