BERNARD L. STREHLER 251 



from (5), and 



from (7), 



we arri\e at 



T/T* = (JcT/hvo) In - .Yo No/VRo (11) 



IT 



In I Xo No/VRo > 1^ - ^ J^^ (12) 





Ro<- Xo ^ e-f''--(-^^(°)/^»)]/^-^ (13) 



It appears that values of XoNq/V of 10^^ are not unreasonable, 

 integrated o\ er an>- small frequency range. Even if 



[hvo - (-AFn/iVo)]/A-r^30 



Nohvo - (-AF(°)) ^ 18 kcal, T = 300° 



values of R,, (integrated over a short frequency range) of the order 

 of 10'' photons per cubic centimeter per second would not seem to 

 violate the second law in any way. 



Equation (13) refers to the rate Ro, at /u'o, of emission of photons 

 at the concentration of reactants used in the computation of AF^°'. If 

 the actual concentrations are lower either the rate should be corrected 

 to unit concentration, or the aF^°' should be computed from the actual 

 concentrations emplo>'ed. In either case the equation will be the same. 



Chemiluminescence from Thermally Activated Intermediates 



Dr. Kauzmann: Suppose that a substance can exist in two states, 

 C and D, and that the change from state C to state D proceeds 

 through thermal activation to any one of a series of intermediates, 

 Ci*, C2*, . . . , each of which then produces state D by emitting a 

 quantum of radiant energy lin, /h'2, . . . , respectively, according to 

 the following scheme: 



C ^ Ci* -> D + /ivi 

 C ^ C2* ^ D + hv.2 



It is convenient to denote the energy change per molecule of the 

 overall reaction C -» D by hvo- This is the energy of the quantum 

 which would be emitted if a molecule in state C could be transformed 



