Potentials for Electrons in Metallic Vapours. 

 Fig. 10.— Zinc. Total and Partial Current Curves. 



75 



Accelerating Potential Ci/oits) 



Conclusions. — The final results are grouped together in 

 Table Y. 



Table V. 

 Summary of Resonance and Ionization Potentials. 



Metal. 



Resonance Potential. 



Wave-length 

 of Radiation. 



Ionization Potential. 



Limiting 



Wave-length 



of Series. 



Observed. 



Calculated. 



Observed. Calculated. 



Cadmium ... 



Sodium 



Potassium... 

 Zinc 



3-88 

 2-12 

 1-55 

 4-1 



379 

 2-10 

 1-60 

 4-02 



3260-17 

 5893- 

 7685- 

 3075-99 



8-92 

 5-13 

 41 

 9-5 



8-95 

 5-13 

 4-32 

 9-35 



1378-69 

 2413- 

 2856- 

 1319-95 



1 



The agreement between the experimentally observed 

 values and the values calculated from the relation hv — eV 

 is in all cases within the limits of experimental error. We 

 have here further striking evidence of the fundamental cor- 

 rectness of deductions based upon Bohr's theory of atomic 

 structure. 



Bureau of Standards, 

 "Washington, D.C. 

 November 24, 1917. 



