WILLIAM ARNOLD 49 



S - A-(Xo - X) 

 Since it is known that the reaction KB ^ K is slow, as is shown by 

 the decay curve of the delayed light, we have during the light flash, 



dX 



dt 



= -alX 



This has the solution 



X = X,e-'iT ^ Xoe- 



-aE 



300- 



^y/6, 



SLOPE = 7.7 X lo"'^ mv/cm^ 



lOxlo'* 



ENERGY (hx/Cm*) 



T r— 1 1 1 I 



10 12 14 16 18 20 



e (arbitrary units) 



Fig. 2. 



Therefore, the intensity of the delayed light will be given by 



,S' = A-Xo(l - e-'E) 

 The initial slope of the curve will be 



dS 



dE 



= A-Xctr 



and the saturation value given by 



o = kXi) 



