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In this contribution we report on a study of structure changes of polycyclic molecules C3H9 and C14H10in the temperature range from 100 to 1400 K. We have used a new molecular dynamics with charges at bonds and have studied time dependence of interatomic distances at these temperatures. It was fount that the interatomic distances can serve as a criterion for conformation transitions between different conformations. Explanation is based on the theory of stability and the theory of parametric resonance.

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