108 



FLUORESCENCE OF THE URANYL SALTS. 



A DETAILED STUDY OF THE RELATION BETWEEN FLUORESCENCE 



AND ABSORPTION SERIES. 



In figure 73 are indicated 2 complete fluorescence groups and 2 

 complete absorption groups for each of the 8 spectra. The remark- 

 able fact is that although no observed fluorescence bands have been 

 omitted which fall within the frequency numbers plotted, each fluores- 

 cence series has its properly related absorption series, and with the excep- 

 tion of the complex C g series of the csesium chloride not a superfluous 



FIG. 73. Polarized bands of fluorescence and absorption; four contiguous groups showing the 

 relation between the green and white components at +20. Dotted lines show computed 

 positions of absorption bands. Solid lines above the base indicate fluorescence; below the 

 base, absorption. 



absorption series is present. Fluorescence bands are designated by the 

 solid lines above the horizontal, and absorption bands by the solid 

 lines below the horizontal. The dotted lines above the absorption 

 bands represent the hypothetical positions of absorption bands, com- 

 puted in the following manner: 



The average interval for the series in question was computed from 

 all available observations on the bands which belong to it, carefully 

 weighted. A hypothetical position for the band in the reversing group 

 was then found by adding this interval to the average of the observa- 

 tions on the position of the preceding band of the series. This hypo- 



