952 Un symmetrical Components in the Stark Effect, 



since this term has an invariable value for equal and opposite 

 values of Z, it follows that the symmetry of the lines is destroyed. 

 Also the parabolic relation between Av and F [or AX and F] 

 is furnished by (29) and (30) respectively. We give here a 

 table of the displacements of the nine lines observed by 



Stark for a hypothetical field of 

 predicted by our theory. 



300,000 volt x cm." 1 as 



p-G )mponent. 





w-coniponent. 





Z 



B, z ... 



AV ... 



4-2 | -2 

 1-962 1-962 



-18-8-14-4 



+ 3 



1-833 



-26-9 



-3 | + 4 



— 4 

 1^314 



+ 31-8 







+1 



1-881 

 -10-3 



-1 

 1-881 



+6-4 



1-833 



+22-9 



1-314 

 -347 



-^ 



00 



1 

 bo 



bO 



CD 



! 

 be 



CO 

 CO 



O 

 CJ* 



The ?i-component line which occupies the original position 

 of the H a line is seen to split into three components — two of 

 which are, however, very close together — for higher fields. 

 The position of these lines may, however, be appreciably 

 affected by higher terms in equation (30) than the last 

 term we have taken account of (i. e. terms in F 3 etc.). It is 

 to be observed that the functions of the quantum numbers 

 involved seem to become more and more important in deter- 

 mining the order of magnitude of the respective terms as we 

 proceed to consider higher powers of F. However, the 

 above calculations ought to furnish a fairly accurate theory 

 for fields of the magnitude we have. considered ; and, in our 

 opinion, it would be highly desirable to make exact measure- 

 ments for such fields. Whether the above predictions will 

 or will not be verified, remains to be seen. 



In conclusion, I wish to express my thanks to Prof. J. W. 

 Nicholson for useful suggestions. 



King's College, Loudon, 

 Mav 1921. 



