﻿552 Mr. D. Coster on the Spectra of X-rays 



§ 4. The classification of the lines proposed in this paper 

 is strongly supported by Tables XVI. and XVII. Table 

 XVI. gives the relativity L-doublets. From this table we 



Table XVI. 

 Relativity L-doublets. 





n-l 



/3i-" 2 



75- & 



3019 

 32-54 

 35-10 

 37-76 

 44-17 

 47-41 

 51-11 

 54-43 

 58-27 

 61-74 

 66-88 

 76-36 

 80-88 

 91-99 

 99-00 



7i-/3 2 



29-86 

 32-29 

 34-79 

 37-71 

 43-64 

 46-88 

 50-46 

 54-19 

 57-43 

 61-58 

 65-68 

 75-05 

 80-22 

 91-64 

 98-05 



79"&4 



L 2 -L, 



57 La 



29-51 



35-53 



37-77 

 43-70 



58-52 

 62-48 

 67 09 

 76-58 

 81-56 

 93-33 

 98-76 



30-01 

 32-35 

 35-02 

 37-86 

 4395 

 47-17 

 50-64 

 54-36 

 58-27 

 62-43 

 66-80 

 76-09 

 81-12 

 92-68 

 98-54 



32*42 

 34-80 

 37-67 

 43-62 

 47-10 

 50-83 

 54-32 



6208 



32-50 

 35-24 

 37 94 



58 Ce ' 



59 Pr 



60 Nd 



62 Sm 



63 Eu 







64 Gd 



65 Tb 



66 Dy 



67 Ho 



68 Er 



70 Yb 



71 Lu 



73 Ta 



74 W 



Table XVII. 



Differences in 



II 





fr-n / 



33-/3, 



72-75 



73-7i 



57 La 



1-054 



1-048 



1-059 



1-060 



1-076 



1-095 

 1-099 

 1104 

 1108 

 1-118 

 1-119 

 1-136 

 1-200 



192 

 192 

 192 

 193 

 194 

 195 

 193 

 195 

 198 

 198 

 196 

 198 

 202 

 204 

 202 

 224 



0-779 

 •782 

 •786 

 •795 

 •801 

 •790 

 •807 

 •806 

 •806 

 •819 

 •802 

 •822 

 •816 

 •848 

 •822 

 •910 



0-504 

 •500 

 •496 

 •495 

 •491 

 •487 

 •488 

 •481 

 •487 

 ■488 

 •494 

 ■498 

 •492 

 •494 

 •483 

 •495 



58 Ce 



59 Pr 



60Nd 



62 Sm 



63 Eu 



64 Gd 



65 Tb 



66 Dy 



67 Ho 



68 Er 



70 Yb 



71Lu 



73Ta 



74 W ... 



83 Bi 





may conclude that the frequency difference yi—j3 2 is essen- 

 tially smaller than the other doublet differences *. As the 



* Compare Part II, § 5 of this paper. 

 Physik, vi. p. 185 (1921), table 3. 



See also D. Coster, Zeitschr. /"• 



