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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 87 



note the decay of intensity in the sharp (^Po,i>2-n^Si) and diffuse 

 (^Po>i>2-n^Di,2,3) series as well as the relative intensities of the com- 

 ponents of these multiplets. 



The classification of the lines measured is given below the spectro- 

 grams in Figures i and 2. More than two thirds of these lines are 

 members of the sharp and ditTuse series. Table 4 gives the relative 

 intensity of these triplets that were of measurable intensity. The 



" Value given includes minur unresolved lines not related t(i the Iriplet (symbols given 

 after wave length are those used in fig. 4). 



diffuse scries is really composed of sextets, but the closely spaced 

 components were unresolved in the present work. The intensities 

 of these groups have the same theoretical relation (1:3:5 for the 

 Int/u*) as do the sharp triplets. It is evident here that the theoretical 

 intensity relation is not attained but that it is approached by higher 

 members of each series. The component whose intensity is most 

 affected by changing from high intensity to low is the central one 

 in both series. Also the component that deviates most from the 

 theoretical rule is the central one in the sharp triplets and the high 

 frequency one in the diffuse triplets. 



