53* 



Table 657 

 RONTGEN RAYS (X RAYS) 



EMISSION LINES AND CRITICAL ABSORPTION LIMITS 



(in Angstroms) 



The characteristic rays group themselves naturally into several groups, K, L, M, etc.; 

 for any given element the lines in one group differ from each other in wave length by amounts 

 which are small compared with the differences between separate groups. The wave lengths 

 of the characteristic rays vary only with the material of the anticathode; these wave lengths, 

 for some of the more prominent lines are given in the table below. 



\ a is the wave length of the critical absorption limit associated with the emission lines 

 listed in the same subgroup. Taken by permission from Compton, "X-rays and Electrons." 



911.76 

 524 

 235 

 133 



84 



49-3 

 36.5 

 24.6 

 18.6 

 14-5 



9.5112 

 7.9470 



5-758o 

 5.0123 

 4-3844 

 3.8657 

 3-4345 

 30633 



2-7517 

 2-4937 

 2.2653 

 2.0648 

 1.8893 

 1-7377 



4937 

 2646 

 0670 

 8932 

 7406 



absent 

 n-591 

 9-5345 

 7-9405 

 6-7393 

 57890 

 50213 

 4-3946 



3.44680 

 3-08343 



2-77394 

 2.50898 

 2.27972 

 2.08045 



1-90591 



1.75272 



18.37 

 11.8836 



9-86775 

 8.31940 



7.10917 

 6.14171 



Xa 



2500 

 I360 

 580 

 380 

 300 

 250 

 2IO 



l80 



I46 



117 



IOI 



84 

 69 

 56 

 46 



37 

 33- 1 

 28.9 



25-4 

 22.5 

 20.0 



177 

 16.0 

 14.6 



Group 



Sub-group 



H 

 He 

 Li 

 Be 

 B 

 C 

 N 

 O 

 9 F 



10 Ne 



11 Na 



12 Mg 



13 Al 



14 Si 



15 

 16 



17 CI 



18 A 



19 K 



20 Ca 



21 Sc 



22 Ti 



23 Va 



24 Cr 



25 Mn 



26 Fe 



* The values in italics are observed values. Other critical absorption limits are computed or interpolated. 

 Smithsonian Tables 



