932 Dr. K. D. Kleeman on Disintegration of an Ion 

 disintegrated through the action of the electric field only 



when the value of — is greater than a certain value, or the 



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kinetic energy of a cluster on collision greater than a certain 

 minimum value, as will be explained more fully further on. 



Now the values of — corresponding to the point d in these 



three cases are respectively 1140, 556, and 280, and thus 

 stand in descending order of magnitude. The extent of 

 disintegration of the clusters over the region in question 

 should therefore decrease with these values. Table II. 

 contains the values from which the curves in figs. 3 and 4 

 were plotted. 



The curves A, B, C, and J) in fig. 6 were obtained with air 

 at a pressure of 2'3 mm. of mercury. The curve E, corre- 

 sponding in type to curve C, was obtained with the pressure 

 3 mm. of mercury. They show that the negative ion clusters 

 in air are disintegrated by an electric field if of appropriate 

 strength. Curves were obtained for different pressures which 

 showed the same characteristics as the curves obtained 

 for C0 2 at different pressures. The curves in fig. 7 were 

 obtained with hydrogen at a pressure of 15 mm. of mercury. 



