CHAPTER X. 



NEODYMIUM SALTS. 



Introduction. Neodyniium salts in aqueous solutions. Neodymium salts in 

 glycerol. Neodymium nitrate in nitric acid. Spectrophotography of the 

 chemical reactions in which neodymium salts take part. Summary. 



INTRODUCTION. 



J. Becquerel has carried out investigations on several neodymium com- 

 pounds similar to those on erbium. Tysonite was especially studied. This is 

 a fluoride of cerium, lanthanum, and didymium and gives mainly the didym- 

 ium spectrum. The bands U 5176 + +, 5234+ +, 6250 (doubles 4.5 unsym.), 

 6740, 6742 + , and 6760+ were found to broaden in the magnetic field. Em- 

 ploying the usual theory of the Zeeman effect, Becquerel shows that X 3995 

 is due to + electrons; A5075+ to + electrons; ^5109+ to electrons; X517Q + + 

 to + electrons; ^5234 ++ to electrons, and X 7642+ to electrons. 



At 180 the bands are much finer. The band X 6249.7 is very fine 

 and from the Zeeman effect it appears to be due to -f and electrons. 

 The following table gives some of Becquerel's results: 



The series of acetate bands is very much like that of the uranyl series, 



_ -J.- _! 



