ro8 Table 61 6 (continued) 



ULTIMATE SPECTRUM LINES AND RAIES ULTIMES* 



(Selected by permission from I. C. T., 5, 322, Meggers.) 



Raies Ultimes. — The strongest lines of any element (the last to disappear when the 

 quantity present is diminished) usually arise from transitions from the lowest level to middle 

 levels of the same multiplicity and belonging to the same family. Among the various lines 

 in a multiplet, that involving the highest inner quantum number is the most persistent; 

 among transitions to terms of the same family, the term of the greatest azimuthal quantum 

 number has the advantage; and the larger multiplicities are preferred to the smaller. In a 

 few cases, the combination of these influences causes a line originating from a level a little 

 above the lowest to be the most persistent of all. 



* Printed in bold-face type. 

 Smithsonian Tables 



