. Ionization and resonance potentials of some nonmetallic elements. curves were obtained tmder a wide range of conditions, as isshown in Table i. Curves 6, 9, 19, and 22 of Fig. 4 were obtainedin the vapor of yellow phosphorus at about room these conditions the vapor condenses in the form of a redfilm, evidently a mixture of red and yellow phosphorus. Curves28 and 38 were obtained in the vapor of red phosphorus at about400° C. At this temperature the vapor condenses in cold partsof the tube in a red film as before and in the hot part in a gray MeUer-Foote . Ionization and Res
. Ionization and resonance potentials of some nonmetallic elements. curves were obtained tmder a wide range of conditions, as isshown in Table i. Curves 6, 9, 19, and 22 of Fig. 4 were obtainedin the vapor of yellow phosphorus at about room these conditions the vapor condenses in the form of a redfilm, evidently a mixture of red and yellow phosphorus. Curves28 and 38 were obtained in the vapor of red phosphorus at about400° C. At this temperature the vapor condenses in cold partsof the tube in a red film as before and in the hot part in a gray MeUer-Foote . Ionization and Resonance Potentials (>1S crystalline form. After once heating red phosphorus to about450° C and getting the red film on cold parts of the tube, vaporpressures suited for current measurements were obtained in awide range of temperature. Curves 31 and 32 were obtained atroom temperature after the tube had been heated. The similarityof all the curves in the temperature range 420° C to 15° C indicatesthat the constitution of the phosphorus molecule in the vapor. 0 2 Volts Fig. 4.—Current-voltage curves for phosphorus IS state does not change in this range. The molecular constitutionof phosphorus vapor at 300° C is given as P4. The mean values from the 43 curves are summarized as follows: Volts Resonance potential 5. 8o±o. i Ionization potential 13. 3 ± .5 As can be seen from Table i, the individual measurements ofresonance potential do not differ from the mean by more than the 676 Scientific Papers of the Bureau of Standards [Voi, 15 probable observational error, but there is more variation in theionization potentials, probably arising in the method of applyinginitial potential corrections. A striking feature of the partialcurrent curves is the large initial potential correction; that is, thedifference between the resonance potential and the appliedpotential at the first resonance point. Clearly it is not a velocitycorrection in this case but probably a contact difference
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