190 



STUDIES IN LUMINESCENCE. 



throughout the range studied and are thus in agreement with the results 

 of Miss Wick. 1 



The appearance of the curve for resorufin suggests that the band is 



.50 .52 .54 .56 

 Fig. 182. Eosin. 



.58A 



.50 



Curve / shows the coefficient of absorption as a func- 

 tion of the wave-length for a dilute solution. 

 Curve // shows the same thing in the case of a 

 concentrated solution. (The vertical scale in 

 curve / is fifty times greater than that of curve 

 //.) Curve F shows the distribution of energy 

 in the fluorescence spectrum of fluorescein. 



.54- 



Fig. 183. 



.58 

 -Resorufin. 



.62 A 



Curve /, coefficient of absorption for dilute solu- 

 tion; curve //, coefficient of absorption for 

 concentrated solution. (The scale of curve / 

 is ten times greater than that of curve //.) 

 Curve // shows the energy distribution in the 

 fluorescence spectrum. 



complex and that in addition to the principal maximum at 0.577 /z there 

 are secondary maxima of absorption at about 0.558 ix and 0.536 /x. If the 

 absorption of resorufin really consists of three overlapping bands, as seems 

 probable, our results indicate that all three of these bands are produced by 

 the ions. 



Table 25. 

 Coefficients of absorption for resorufin. 



Frances G. Wick, Physical Review, xxiv, p. 356; see also Chapter II. 



