p. C. WILHELMSEN, R. LUMRY AND H. EYRING 



83 



was carried out on several runs made at different temperatures, but 

 with the same initial concentrations of reagents. These values are 

 given in Table I and are plotted in Fig. 5. 



The variation in the quantity of light emitted was assumed to be 

 proportional to the change in cp. To obtain an equation for the 



950 



875 



800 



Degrees absolute 

 Fig. 5. Total light \ersus temperature. 



temperature dependence of <t> it is necessary to return to equation 7. 

 If it is assumed that one particular mode of quenching is the 

 principal one, equation 7 becomes 



= 



A-i 



^-1 + k' 



(8) 



The rate of emission of light by an excited molecule is usually inde- 

 pendent of temperature and therefore any temperature effect will 

 generally be on k'. The rate fc' is given by the rate equation 



k' = 



h 



(9) 



