AS MEASURED IJY MEANS OF THE RADIOMICROMETER. 



67 



in part be due to the combined effect of the slight water absorption and, 

 even a more important factor, the slit-widths, as discussed above. 



The regions of maximum transmission occur near X7600 and X8400, and 

 solutions of neodymium chloride become almost completely transparent 

 beyond 1/jl, except for the general absorption of the solvent. Slight absorp- 

 tion bands occur in this region, one near 1.5/x, but they are so masked by the 

 intense water absorption that it was found impossible to make a quanti- 

 tative study of them. 



75 



2 

 O 

 1/5 

 i/} 



5 

 i/) 



2 



UJ 



a 



u 

 <r 



LJ 

 Q. 



50 



25 



Neodymium Chloride 



Cell Depth 2.5mm. 

 Concentration 2.141 N. 



0.65// 



0.7a 



0.75,7 



Fig. 



0.8^ 

 18. 



0.85^ 



0.9// 



\.M 



100 



75 



2 



o 



50 



u 



a: 



UJ 



25 



65// 



Neodymium Chloride 



Cell Depth 5mm. 

 Concentration 



071 N. 



0.8// 

 Fig. 19. 



95// 



From a comprehensive study of the four curves representing the absorp- 

 tion spectra of concentrated solutions of neodymium chloride, it seems 

 probable that Beer's law holds quantitatively for the infra-red region, except 

 for such slight changes as have been fully discussed above. 



