THE THEOKY OF IONIZATION OF 

 GASES BY COLLISION 



CHAPTER I 



IONIZATION BY NEGATIVE IONS 



1. Variation of current with electric force. 



THE process of ionization by collision between ions 

 and molecules of a gas may be examined by investigating 



Electric Force. 

 Figure 1. 



the currents between parallel plate electrodes when ultra- 

 violet light falls on the negative electrode or when the 

 gas is ionized by Bontgen rays. If the gas is at a high 

 pressure, the current increases with the electric force and 

 I.G. B 



