Cluster in a Gas under Influence of an Electric Field. 931 



cm 



at 0°, which is equal to 3*96 x 10 4 ' . Since the ion cluster 



' sec. 



gets up momentum during two consecutive collisions, which is 



reduced on collision, its velocity on collision is very much 



greater than the average velocity of translation of a molecule. 



But some clusters are already disintegrated by the electric 



field when — has the value 640, which corresponds to the 



P 

 point b. The calculated velocity of a cluster is then 



. ., iri . cm. 



4*1 xlO 5 . 



sec. 



The curves in fig. 4, each of which corresponds to a curve 

 in fig. 3, were obtained with G0 2 at a pressure of 2'3 mm. of 



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mercury, and the curves in fig. 5 with C0 2 at a pressure of 

 5 mm. of mercury. We see that at the pressure 2*3 mm. the 

 disintegration over the region od is not so pronounced as at 

 the pressure 1 mm., and at a pressure of 5 mm. the dis- 

 integration over that region has practically disappeared. 

 But this is to be expected. For a cluster on the average is 



