70 



ABSORPTION SPECTRA OF A NUMBER OF SALTS 



It will be noticed that beyond 0.9ju all of the curves drop sharply with 

 dilution, which is due entirely to the increasing absorption of the water. 



Figs. 22 to 25, inclusive, show just what might be anticipated from 

 figs. 18 to 21, a lowering of absorption maxima as we pass towards the 

 more dilute solutions. This change is most marked in the X8700 band, and 



100 



75 



z 

 o 



50 



UJ 



O 



< 



z 



UJ 



u 



a: 



UJ 



CL 



25 



Neodymium Chloride 



Cell Depth 10 mm. 

 Concentration 0I33N 



0.65/u 



0.7// 



0.75/; 0.8// 



Fig. 24. 



0.85// 



0.9/; 



0.95/j 



100 



75 



o 



us 



s 



SO 



UJ 



u 

 tr 



LU 



? c > 



Neodymium Chlondo 



Cell Depth 20 mm. 

 Concentration 0.067 N 



0.65// 



0.7// 



0.75/< 



Fig, 



08,(/ 



25. 



0.85// 



0.9// 



0.95// 



it is in this region that the absorption of the water is most pronounced, 

 although a 20 mm. layer of water in this region has at no point over 10 per 

 cent absorption. The change in the intensity of the absorption band is 

 greater than this amount, but it seems probable that this, together with the 

 added correction for the slit-widths, may account for the phenomenon, and 

 that Beer's law holds for the dilute solutions of neodymium chloride. 



