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The approach for calculation of the mode intensities of DNA conformationalvibrations in the Raman spectra is developed. It is based on the valence-optictheory and the model for description of conformational vibrations of DNA withcounterions. The calculations for Na- and Cs-DNA low-frequency Raman spectrashow that the vibrations of DNA backbone chains near 15 cm-1 have the greatestintensity. In the spectrum of Na-DNA at frequency range upper than 40 cm-1 themodes of H-bond stretching in base pairs have the greatest intensities, whilethe modes of ion-phosphate vibrations have the lowest intensity. In Cs-DNAspectra at this frequency range the mode of ion-phosphate vibrations isprominent. Its intensity is much higher than the intensities of Na-DNA modes ofthis spectra range. Other modes of Cs-DNA have much lower intensities than inthe case of Na-DNA. The comparison of our calculations with the experimentaldata shows that developed approach gives the understanding of the sensitivityof DNA low-frequency Raman bands to the neutralization of the double helix bylight and heavy counterions.

Intensities of the Raman bands in the low-frequency spectra of DNA with light and heavy counterions