AB Systems Involving Two Species

The previous example consisted of single photochemical step A - B In photochromic systems, such a photochemical step is often associated with either a 

Establishment of the General Kinetic Equation under Continuous Irradiation 

In AB systems, the two species A and B obey the law of conversation of matter given by 

The kinetic equation of the overall systems thus only includes a single variable, for example, [A], giving 

Canceling the rate constant ABa or/and the quantum yield ba leaves all the sets of subsystems that can be constructed from the AB, 2 (), 1 k system,namely, theAB l j , theAB, l t , Ik, and the AB 2 J systems. 

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