136 



FLUORESCENCE OF THE URANYL SAL1S. 



be said that not a fluorescence or absorption band of any of the salts 

 fails to fit into one of the constant-frequency series. 



TABLE 46. Series in the fluorescence spectrum of mono-ammonium uranyl nitrate. 



In section i it was shown that in the spectrum of the uranyl nitrate 

 the intervals of the fluorescence series are the same for all series within 

 the errors of observation ; in the case of the absorption series, however, 

 the interval is not the same for all series. In the double nitrates we 

 find an unmistakable variation in the fluorescence intervals as well as 

 in the absorption. In the mono-ammonium nitrate the interval varies 

 from 86.4 for series M to 89.0 for series B. In the di-ammonium nitrate 

 the interval varies from 83.7 for G to 85.0 for E. In the mono-potas- 

 sium nitrate spectrum the interval varies between 86.4 for G and 87.9 

 for- J. In the di-potassium nitrate the interval varies between 86.2 

 for E and 87.6 for J. 



The variation of the interval in the absorption series is of the same 

 order of magnitude; e. g., an extreme variation of 1.4 in the mono- 

 ammonium, 3.5 in the di-ammonium, 4.3 in the mono-potassium, and 

 4.4 in the di-potassium nitrate. In this connection it was thought to 

 be of interest to compare the ratios of related fluorescence and absorp- 



