POLARIZED SPECTRA OF DOUBLE CHLORIDES. 



Ill 



TABLE 35. Polarized series at 20 C. continued. 



URANYL CAESIUM CHLORIDE. 



THE EFFECT OF LOW TEMPERATURES ON THE RESOLUTION AND 

 POSITION OF THE BANDS. 



It has been shown in Chapter V that low temperature tends to 

 narrow all the bands in the spectra of the double chlorides, to resolve 

 them into doublets, and to produce certain shifts in their position. 

 These temperature shifts were explained by assuming that the bands 

 at +20 are close overlapping doublets, the stronger components of 

 which are weakened by lowering the temperature, while the weaker 

 components are strengthened. Such shifts occur in all of the polarized 

 spectra here under consideration and the same explanation is appli- 

 cable. They will be considered in detail in a later paragraph. 



In table 36 are recorded the observed positions of the fluorescence 

 and absorption bands in the two polarized components at --185. 



Figure 74, like figure 73, is a map of four contiguous groups, two of 

 fluorescence and two of absorption, inserted to facilitate the compari- 

 son of the green and white components as regards the location of the 

 bands. Since the arrangement repeats itself from group to group, it 

 is unnecessary to include the outlying regions toward the red and 

 toward the violet. 



