72 



ABSORPTION SPECTRA OF A NUMBER OF SALTS 

 NEODYMIUM NITRATE. 



Table 14 gives the percentage transmission for solutions of neodymium 

 nitrate. Column 1 gives the respective wave-lengths at such intervals as 

 the solutions required. Reading from left to right, we find the percentage 

 transmissions for the following concentrations: 2.010, 1.050, 0.525, and 

 0.262 normal, respectively, the corresponding depths of absorbing layers 



100 



75 



z 

 o 



10 

 !2 

 2 



in 



UJ 







Z 

 UJ 



o 



cr 



50 



25 



0.65// 



100 



75 



z 

 o 



to 



2 

 i/> 



z 



s 



t- 



o 



. 

 I 



z 



UJ 



50 



25 



0.65// 



Neodymium Nitrate 



Cell Depth 2.5mm. 

 Concentration 2 01 N 



0.7 A 



0.75// 0.8// 



Fig. 26. 



0.85// 



0.9// 



0.95a 



Neodymium Nitrate 



Cell Depth 5 mm. 

 Concentration 1.05 N 



0.75// 0.8a 



Fig. 27. 



0.95// 



being 2.5, 5, 10, and 20 mm. Figs. 26 to 29, inclusive, represent these 

 results, the abscissae being wave-lengths and the percentage transmissions 

 being given as ordinates. It is seen that the absorption bands in the nitrate 

 solutions, as with those of the chloride discussed above, show three minima 

 at X7300. X7950, and X8750. The nitrate bands are not as intense as those 



