The London, Edinburgh and Dublin philosophical magazine and journal of science . volts. The other curvesrepresent partial current between the net and cylinderagainst a retarding field of about 0*2 volt. Analysis o£these curves is given by Table III. It will be noted that Table III. Ionization and Resonance Potentials for to fig. 3. Applied Resonance Potential. ~. 77^ Potential . » . Curve, a. b. c. d. e. f. t „ J . for c_6j ^c# e_dm f_6i Ionization. 6 ... 1-5 2-7 3-8 1-2 M 7 ... 1-5 25 3:45 46 56 ... 1-0 0-95 M5 10 8 ... 1-4 2-5 3-6 4-7 1*1 1-1 ll ... 9 0-25? 1-5 2-5 1-0 10
The London, Edinburgh and Dublin philosophical magazine and journal of science . volts. The other curvesrepresent partial current between the net and cylinderagainst a retarding field of about 0*2 volt. Analysis o£these curves is given by Table III. It will be noted that Table III. Ionization and Resonance Potentials for to fig. 3. Applied Resonance Potential. ~. 77^ Potential . » . Curve, a. b. c. d. e. f. t „ J . for c_6j ^c# e_dm f_6i Ionization. 6 ... 1-5 2-7 3-8 1-2 M 7 ... 1-5 25 3:45 46 56 ... 1-0 0-95 M5 10 8 ... 1-4 2-5 3-6 4-7 1*1 1-1 ll ... 9 0-25? 1-5 2-5 1-0 10 ... 1-7 28 3-8 11 1-1 11 ... 1-7 2-8 1-1 4 ... 66 Means 6*6 1*07 volts. Mean Initial Potential 07 Mean Ionization Potential 73 volts. InitialPotential 0-6 +0-64-0-74-064- 0-7 Resonance Potentials for Electrons in Metallic Vapours. 39 the first point of resonance was very difficult to one curve, 9, shows this point clearly; and even inthis case the value of the potential could not be observedwith great enough precision to justify its use in determining Fig. 0 I Z34567S Acceleratinq Potential Volts Variation with accelerating potential of current to outside cylinderand of total current from hot wire. Thallium. the final value of the resonance potential. The fact that thispoint does not show up as distinctly as the other resonancepoints is due to the temperature distribution of initial velo-cities of the electrons, and to the thermionic emission of all 40 Dr. Foote and Dr. Mohler on Ionization and parts of the apparatus on account of the high temperature,900° C, required. The partial current curves 6, 7, 8, 9 corre-spond to the total current curve 4, and were accordingly usedfor determining the initial potential. The initial potentialsfor curves 10 and 11, taken some time later, are a triflehigher. The final values obtained for thallium were 7*3 voltsfor the ionization potential and 1*07 volts for the resonancepotential. Discussion of the Results. If we apply
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