Abstract
The vibrational characteristics of the FCC–cryocrystals with substitutional impurities have been analyzed. A “non–central” impurity atom in environment of the “central” host atoms is considered. The difference between equilibrium interatomic distances $$\widetilde{r_0 }$$ and r 0 of the impurity and host atoms, respectively, causes their non–central interaction. A very strong dependence of the impurity frequency spectra on the ratio $$\widetilde{r_0 }/r_0 $$ is shown. The range of the values of this ratio which corresponds to dynamical stabitity of the system under consideration is determined.
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