92 Dr. P. D. Fooie and Di 



W. F. Meggers on Atomic 



rapidly approaches go as the voltage is decreased, conclusively 

 proves the existence of a single-line spectrum, in this case 

 the doublet l\5s— 2p±. 



The results are somewhat complicated by the fact that 

 most of the electrons have a velocit}^ greater than that corre- 

 sponding to the applied potential. The fact that all of the 

 series lines begin to appear at the applied potential of about 

 2*5 volts, indicates the presence of ionization which should 

 normally occur at 3*9 volts. This is again shown by fig. 5, 



Fie. 5. 



^^\ 



0J23* 

 Volts Applied accelerating (aotervtial 



Current reaching anode as a function of the applied accelerating- 

 voltage. 



which represents the current reaching the anode as a function 

 of the applied accelerating potential. A marked break point, 

 indicating ionization, occurs at 2 '9 volts. This ionization 

 might be explained on the assumption of ejection of electrons 

 from the 2p rings, which requires but 2*4 volts velocity, but 

 such is not the case. If a 3-electrode tube is employed, it 



