Reactions with a difference in the dependence on intensity

10 Reactions with a difference in the dependence on intensity In the assumed photochemical consecutive mechanism 

Up to now the function Fff ) was considered to be primarily a function of concentration. For this reason it was integrated together with the concentrations themselves. If no slow dark reactions have to be considered, and if all partial photochemical reactions depend in the same way on the intensity of irradiation, the fundamental differential equation, eq. (3.72), can be rearranged as 

In this case the principal task is the calculation of t according to 

In consequence one calculates the relevant A0 as well as F E ) according to eq. (3.99) for a given beginning at = 0. By this means one obtains the different elements of the integral in eq. (3.100). 

This method has only a few advantages in the calculation of the turnover in comparison to the method given above. However, eq. (3.99) allows a qualitative impression of the time dependence to be obtained. Furthermore the approximation 

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