SOLITON-INDUCED MODIFICATION OF THE SPEED OF SOUND IN QUASI-ONE-DIMENSIONAL MOLECULAR-CRYSTALS

The influence of the anharmonic vibron-phonon coupling, arising on acc ount of a 'dressing' effect, on the characteristics of the lattice sub system in quasi-one-dimensional molecular crystals was examined within the 'pseudo-harmonic' phonon approximation. It was found that soliton s could induce specific modifications of the speed of sound which show s a temperature dependence quite different to that in the case of the linear excitations. The possibility of an indirect experimental verifi cation of the existence of solitons in molecular chains is suggested o n the basis of these predictions.