250 



Dr. L. Vegard on the X-Ray Spectra 



values <7 3 =1, 11 or 12 give the best agreement, at any 

 rate for small atomic numbers, we cannot be certain that the 

 particular value which gives the best agreement is also 



the right one 



Empirical values. 



? 3 = 1 

 2 

 3 

 4 

 5 

 6 



B. 



+2 0556 

 2-087 

 2-198 

 2-258 

 2-288 

 2-298 

 2-291 



Table VI. 

 c. 



+7-6 

 5-3 

 6-4 

 7-1 



7'5 

 7-8 

 8-0 



*.. 



B. 



C. 



7 



+2-271 



4-81 



8 



2-242 



8-2 



9 



2-196 



8-2 



10 



2-159 



8-1 



11 



2-099 



79 



12 



2-036 



7-6 



13 



1-968 



7-2 



In order to make a choice between the q z values we have 

 recourse to the M- series. As we shall see later on the 

 explanation of the M a -line gives the two possibilities ^3 = 8, 

 (jz = 12. The first value corresponds to the assumption of 

 two — the second to the assumption of one system with quant- 

 number 3. 



In Table VII. nre given observed and calculated values 

 for various atomic numbers. The calculated values are cor- 

 rected for variation of mass with velocity. 









Table VII. 









N. 



*/ R ob, 



"/ R cal. 



2 2 =7, 



D. 



P. 



"/ E cal. 



? 2 =7, 

 g 3 =S. 



D. 



P. 



30 



73-8 



71-6 



- 2-2 



-3-0 



660 



-7-8 



-106 



40 



149-8 



1491 



- 0-7 



-0-5 



141-4 



-8-4 



- 5-6 



50 



253-5 



2551 



+ 1-6 



4-0-6 



245-3 



-8-2 



- 3-2 



60 



3846 



390-3 



+ 5-7 



+ 1-5 



378-4 



-6-2 



- 1-6 



70 



445-6 



555*1 



+ 9-5 



4-2-1 



541-1 



-4-5 



- 10 



80 



7349 



7514 



4-16-5 



4-2-2 



735-3 



4-0-4 



o-o 



90 



952-2 



9796 



+27-4 



4 2-9 



961-3 



4-9-1 



4- 1-0 







D = ^/I 



W— >7Robs.> P — 



100 D 



, 





Jobs. 



The assumption ^ = 12 gives the best agreement for [small, 

 while #3 = 8 is the better for high atomic numbers. As we 

 shall see later on the frequencies of Kp are in favour of the 

 assumption q 3 =S. 



