Theory and Low Voltage Arcs in Ccesiwn Vapour, ( .U 

 of X8521 to that of the prominent lines \6973 and \4555 



or various voltages : — 









J -r- J 



J -f- J 



Applied Voltage 



8521 6973 



8521 4555 



6 



105 



(130) 



(200) 



560 

 1100 



350 



5 



(400) 

 (600) 

 2100 



4 



3 



2-8 



8300 



2-(\ 



620 

 3600 



3400 



2-4 



10500 



2"2 



> 10000 



> 10000 



1-8 



= co 



_!_ 'CO 



1-5 



= CO 







= CO 





Fig. 4. 















76-99 ^^ 



K 

 Na. 









/ ^ 



^^*S*9Z 





1 









'8521 







4 



/-" 





r "" 



7945 







^^ 





-<5^ 



6974 

 6724 



+555 



J^r 









4593 



1 



^ ^ 



tit 







>^« 



~6S87aa/S335 









/7 





















* 3 



Volts Allied a.ccelerQTin<) potential 



Logarithm of intensity of various caesium lines as a function of 

 the applied exciting voltage. 



Thus, below 2*4 volts the intensity of X8521 is thousands of 

 times greater than\6973, while above the ionization potential 

 the ratio is approximately 100. The fact that the ratio of 

 intensity of A 8521 (and X8943) to that of any other line 



