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Lifetime Distributions of Chemical Species

In chemical kinetics the lifetime of an active intermediate is an important variable which characterizes the time scale of the process in which the intermediate is involved. Different techniques have been suggested for the direct experimental evaluation of this parameter they are used extensively for the analysis of chain reactions [13] such as radical polymerization [14]. These techniques are based on the assumption that the mean lifetime of an active intermediate X, can be evaluated as the ratio between its concentration x, and its rate of disappearance W  [Pg.171]

We consider an open isothermal system made up of many active intermediates X, / = [Pg.171]

as well as many stable species A,, / = 1,2, The deterministic evolution [Pg.171]

We denote by r]i (t t) dr the density of particles of type Xi at time t with a lifetime in the system between r and t + dr. We have [Pg.172]

For evaluating these density functions we notice that the ratio [Pg.172]


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