System’s analysis of vibrational spectra in dimmers of 5X-substituted uracile

On based of method DFT/b3LYP for parameters of adiabatic potential for the substituted 5X-uraciles (X = CH$_3$, NH$_2$, F, Cl) the theory of characteristic vibration for monomers and dimmers for the regarded class biomolecules are constructed. The indications of spectral identification for dimmers with strong hydrogen bonds are revealed.