. Ionization and resonance potentials of some nonmetallic elements. Volts Z 3 4 5 6 Fig. 5.—Current-voltage curves for iodine by C. G. Found^ from the current voltage curve obtained in a two-electrode tube as volts. The presence of a contact potentialdifference of about i volt, observed by us but of course impossibleto detect in a two-electrode tube, would explain the differencebetween otir results. Phys. Rev., 15, p. 132:; 1920. 678 Scientific Papers of the Bureau of Standards 3. SULPHUR {va. 16 Table 3 gives the results obtained in sulphur vapor, and Fig. 6shows some typical curves. Curv
. Ionization and resonance potentials of some nonmetallic elements. Volts Z 3 4 5 6 Fig. 5.—Current-voltage curves for iodine by C. G. Found^ from the current voltage curve obtained in a two-electrode tube as volts. The presence of a contact potentialdifference of about i volt, observed by us but of course impossibleto detect in a two-electrode tube, would explain the differencebetween otir results. Phys. Rev., 15, p. 132:; 1920. 678 Scientific Papers of the Bureau of Standards 3. SULPHUR {va. 16 Table 3 gives the results obtained in sulphur vapor, and Fig. 6shows some typical curves. Curves 3, 22, and 26 show the partialelectron current reaching the plate as measured by method 30 shows the same obtained by method 2. Curves 11 and. 0 2 Volts Fig. 6.—Current-voltage curves for sulphur 16 show the ionization point by the Lenard method. Measure-ments were made in the temperature range 120° C to 170° probable molecular structure of the vapor is Sg. Difficulty with imsteady currents was a source of trouble inthese measurements but this unsteadiness gradually decreasedif the temperature was held constant for some time. The cause Poolr^ Ionization and Resonance Potentials 679 of this was unknown. As can be seen from Fig. 6 the curves showinflections capable of fairly accurate measurement, but, unlikethe other vapors, the agreement between results from differentcurves is scarcely within the probable error in picking out thepoints. It can be seen from the figure that in some of the curvesthe second resonance inflection is not halfway between the firstand third. The existence of two resonance potentials is a probableexplanation. Determination of the ionization potential gave asconsistent results as the other ele
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