Cluster in a Gas under Influence of an Electric Field. 933 



They also show that the negative ion clusters in hydrogen are 

 disintegrated by an electric field if of appropriate strength. 



The value of — for the first point of the curve C in fig. 6 











h 



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c 



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Fig. 7. 







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tt 



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r 



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■x _,l_j» 



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Volts 



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1200 



800 1000 



— > Volts per cm. 



laoo 



cm 

 for air is 320, and 4*3 x 10 7 — ' is the corresponding calcu- 



sec. 



lated velocity of a cluster. The velocity of translation of a 



molecule of air at 0°C. is 4'92 x lO 4 ^. The value of - 



sec. p 



for the first point of the curve C in fig. 7 for hydrogen is 53, 

 the corresponding calculated velocity of a cluster being equal 



to 2'Qx 10 7 — '- . The thermal velocity of a molecule at 0° C. 

 sec. 



is 1*859 x 10 5 . It appears, therefore, that the velocity of 



disintegration of an ion cluster is much greater than the 



average thermal velocity of a corresponding molecule. The 



distance between plate and gauze in these experiments was 



•5 cm. The values from which the curves were plotted will 



be found in Table III. 



Phil. Mag. S. 6. Vol. 27. No. 162. June 1914. 3 Q 



