par Prigogine, Ilya 
Référence Annals of the New York Academy of Sciences, 988, page (128-132)
Publication Publié, 2003-05
Référence Annals of the New York Academy of Sciences, 988, page (128-132)
Publication Publié, 2003-05
Article révisé par les pairs
| Résumé : | Chemical reactions correspond to irreversible processes creating entropy. Chemistry belongs to the class of nonintegrable Poincare systems. In general, chemistry is associated with resonances - transitions of quantum states. We have studied some very simple examples of such processes, like decay of an unstable state, in detail. (In such cases, there are always multiple time scales.) We obtain a nonunitary ("star unitary"), invertible, nondistributive operator A (which reduces to the unitary transformation operator U for integrable systems). The explicit form of Λ depends on the interaction of each species with all other types of molecules in the system including the solvent. The basic property that results from Λ is that the fundamental description of nonintegrable systems is no longer in terms of Hamiltonian equations, but in terms of kinetic equations with broken time symmetry. Once we have the kinetic equations, it is easy to show that we have irreversible processes and entropy production. |
