The effects of structural nonrigidity in molecular systems

The results of experimental and theoretical studies of the influence of lar ge-amplitude motions of nuclei on the IR and Raman spectra, electrooptical parameters, and structural features of molecular systems in various states of aggregation are generalized. The mechanisms of intramolecular rearrangem ents in these systems are considered. The potential of the finite element m ethod for the description of large-amplitude motions of arbitrary form is d emonstrated. A method for estimation of the characteristic time of intramol ecular rearrangements is proposed.