Stationary and non-stationary kinetics of the photoinitiated by Medvedevskikh, Yu. G

By Medvedevskikh, Yu. G

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12]. According to Refs. [11, 12], for the determination of macroscopic characteristics of an indignant singlecomponent system at the initial moment of time t0 , it is necessary to assign all its 2/ parameters (j is the number of degrees of freedom of the particle, N is the number of particles). 33) in which OJ is full distribution function or a density of probability and xi is the total of variables determining the state of one particle. In contrast, at equilibrium the single-component system is determined by the assignment of only two parameters, for example, free energy F and temperature T.

5. Characteristic numbers of a pre-quasistationary system In accordance with the above, the field of formal kinetics begins at t > > t2 *. On this state of evolution of the indignant chemical system the stationary concentration of an activated complex and equilibrium distribution of energy on all degrees of a molecule's motion are determined. 44)) via the relaxation time r1* determines the functional dependence of the activated complexes concentration from the concentration of the composing and the intermediate substances and, furthermore, decreases the number of independent chemical transformations to the number of an elementary reaction.

89) The principle of independency of the final reactions in non-equilibrium systems complicates the chemical system and it becomes indefinite, since from this point of view it is necessary to consider all thermodynamically allowed directions of the chemical process described by the different final equations as independent ones. However, in practice, this indefinition always can be minimal, for example, as a result of neglecting the final reactions of which the rate is small and does not essentially influence the change of composition of a system.

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