﻿7 -IS Prof. H." A. Erikson : Recombination of Ions in Carbon 



Carve A in the figure shows graphically the above values 

 of (a) for carbon dioxide. Curve B shows how N varies 

 with temperature. Q remains the same at all temperatures. 



00 14-0 180 



Curves C and D show the corresponding values previously 

 determined for air. 



Hydrogen. 



The hydrogen used was obtained by the electrolysis of water, 

 and was dried by passage through a coil immersed in liquid air. 



In this gas also the coefficient of recombination was found 

 to increase as the temperature w T as lowered, its value being 

 thirteen times as great at —179° C. as at +23°. The values 

 obtained are as follows, the units being arbitrary: — 



Temp. 



N. a. 



•23° C. 

 -64 

 -179 



614 

 4 30 

 1-66 



•45 



•90 



6-00 



Curves E and F in the figure shovv the above values 

 graphically. 



The probable cause of the above variation in a. is, it seems, 

 the change in the thermal velocity of the ions as the tempe- 

 rature is altered. There is undoubtedly a relative velocity 

 above which the ions cannot recombine. If we think of such 



