. Les potentiels d'ionisation et de résonance de certains éléments non métalliques. ,À savoir, la mesure de l'impact inélastique par méthode i et ofionization par la méthode avec des connexions Lenard iwere méthode appliquée comme avant pour le meastuement des potentiels. Fig. 9 montre les types de courbes obtenues. 37 courbes, 64, 65,et 18 d'afficher les points d'impact inélastique, alors que 54, 30 et 31 showcm^es obtenues par la méthode Lenard. Manyvariations Les courbes montrent que la pression et la densité de courant sont modifiés. Thuscurves 18 et 65 montrent deux collisions successives 1019 résonance près de Ber. Deut. Phys. Ges., 21, p. 728 : 191

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. Ionization and resonance potentials of some nonmetallic elements. , namely, measurement of inelastic impacts by method i and ofionization by the Lenard method with connections of method iwere applied as before for the meastuement of the potentials. Fig. 9 shows the types of curves obtained. Curves 37, 64, 65, and 18 show points of inelastic impact, while 54, 30, and 31 showcm^es obtained by the Lenard method. The curves show manyvariations as pressure and current density are changed. Thuscurves 18 and 65 show two successive resonance collisions near 10 19 Ber. Deut. Phys. Ges., 21, p. 728: 1919.•0 Proc. Roy. Soc: March, 1930. MohlerFoote , Ionization and Resonance Potentials 687 and 20 volts and between these points a sharp break due to thesecond ionization potential. Curve 64 shows inflections due tothe first resonance potential alone, while 65 shows a definitely-greater interval between inflections which probably meastires asecond resonance potential. Curves of this latter type could beobtained only under a small range of conditions. Unfortunately. 0 ? T 10 VoHi Qcceltratin^ Fig. 9.—Current-voltage curves for hydrogen our apparatus and method did not serve to separate the tworesonance potentials so as to measure both from the same curve.Many of the curves showed a broadening out of the inflection near20 volts that may be well explained by the superposed effect of tworesonance potentials. Curves 64 and 65 show this effect to a slightextent. 688 Scientific Papers of the Bureau of Standards [Voi. i6 Ctirve 30 was taken with the Lenard method using high gal-vanometer sensitivity and shows the radiation effect starting at 9volts and the first ionization point at 12.5 volts. Only a few curvescould be obtained showing both these points sharply. Curve 31 was taken under the same conditions except that thegalvanometer sensitivity was much less, so that the radiation effectwas immeasurable. It shows both ionization points. Curve 54is another of the same type. Ciuves of

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