1034 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1956 



18 



16 



14 



12 



10 



-50 



■50 -25 





 St 



-25 



25 



50 



75 



100 



125 



28 



26 



24 



22 



20 



18 



16 



14 



12 



10 



150 



Fig. 5 — Curves showing AG (surface conductivity, in units of eij.pni£) and 

 S surface charge, in units of en,£) for the 22.6 ohm-cm sample (upper curve) and 

 for the 8.1 ohm-cm sample (lower curve). Values of Y, deduced from the surface 

 conductivity, are indicated on the curves. 



place at which fitting was at all difficult was at the extreme wet end. For 

 most of the range, therefore, the method is at least internally consistent. 

 Fig. 5 shows the result of carrying out this procedure for the n and p- 

 type samples. The data were averaged over a number of runs. The num- 

 bers appearing on the curves represent values of Y, obtained by reference 

 to Tables V and VI. 



