1038 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1956 



10 



w 



> 4 



10 



W 



10" 



10-2 



-6 -5 



-3 -2-1 1 



Y-ln\ 



Fig. 9 — The function (a2s/S5)y/(9S,/ay)j plotted against F - In X. Dots: 

 p-type; circles: n-type. 



VI. FURTHER COMMENTS 



The development given in the previous section has concerned particu- 

 larly the properties of the fast states. As to the slow states, the experi- 

 ments are much less informati^'e. The variations of 1^ with gas are 

 generally consistent with the variations of contact potential previously 

 reported/ although the total range in Y (±0.13 volt) is smaller by about 

 a factor of 2 than that in contact potential found in the previous work. 

 One must say that roughly half the change of contact potential is in 

 Y B , (i.e., 8Y) and half in Vd , the potential drop across the ion layer. 



