212 JONES-STRONG— THE ABSORPTION SPECTRA [April 24, 



chloride were added. The addition of calcium chloride causes the 

 ultra-violet, the blue-violet band and the uranyl bands to widen gen- 

 erally. The effect upon the uranyl bands is however, very small. 

 The effect of aluminium chloride, however, is very great, The two 

 narrow and faint bands at A 5200 only appear in the pure aqucouf 

 solution of uranyl chloride. The a band in the aqueous solution 

 is about 60 Angstrom units wide, and is almost as intense as the b 

 band. The addition of aluminium chloride causes the band to be- 

 come quite narrow, about 25 Angstrom units wide. A slight addi- 

 tion of alminium chloride decreases the intensity of the band very 

 considerably. Further increases in the amount of aluminium has 

 very little effect. The addition of alminium also causes the bands 

 to shift to the red ; the shifts in some instances amounting to 25 

 Angstrom units. The b and c bands have their intensity very greatly 

 nicreased by the addition of aluminium chloride ; and by making 

 the solution about 2 normal of aluminium chloride these bands are 

 shifted about 30 Angstrom units to the red compared with the same 

 bands for the pure uranyl chloride solution. The d, e, f, g and h 

 bands are also increased in intensity, but are but very slightly 

 shifted to the red. The d and e bands are widened so that they 

 practically form a single band. 



{e) Absorption Spectrum of Uranyl Chloride in Methyl Alcohol. 



In the absorption spectrum of uranyl chloride in methyl alcohol 

 the a, b, c, d, e, f, g, h, i, and / bands all appear, the b and c bands 

 being the largest and most intense. The following are the approxi- 

 mate wave-lengths of the bands: 



abcdefghij 

 Uranyl Chloride in 



Methyl Alcohol 4930 4760 4590 4465 4345 4220 4090 3980 3860 3760 

 Uranyl Nitrate in 



Methyl Alcohol 4930 4760 4610 4460 4325 4190 4070 3970 3855 

 Uranyl Acetate in 



Methyl Alcohol 4900 4770 4600 4460 4320 4200 4090 



It is seen from the above table that the uranyl bands of these 

 three salts in alcohol occupy almost exactly the same positions. 



