Thermal Relaxation of an ABC System

The thermal relaxation of an ABC system may involve up to six elementary first-order processes relating the three components A, B, and C. A typical example would be the thermal ABC, 6k system (see Table 3). From the mass balance equation  

An interesting feature of this system is that whatever the true number of processes (two to six), A, B, and C all change according to a biexponential law of 

The shape of the relaxation kinetic curve depends on the elementary rate constants and on the three initial nonequilibrium concentrations [A]0, [B]0, and [C]0. The first amplitude for species A is given by 

If the three species A, B, and C absorb, the change in absorbance will be given by 

KLgur A4. Example of bieAponenliaL kinclm. (A) Mono onic bicxpanciiliaL (at f — I). 7. 

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