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Far-infrared measurements, between 3 and 450 cm^-1, of absorption spectra of highly oriented films of Li-DNA and Na-DNA in the temperature range 5--300 K are reported. Five low-frequency infrared-active vibrational modes are observed. The lowest infrared-active mode at 45 cm^-1 for Li-DNA and 41 cm^-1 for Na-DNA, as observed for the first time, is found to soften upon sample hydration. Studies of the hydration-induced absorption at the low-frequency end of the spectrum also show a pronounced absorption band at about 10 cm^-1 that is attributed to relaxation processes. Based on a simple lattice-dynamics model, the description of low-lying vibrational modes of DNA is presented. Eigenvectors of the lowest infrared-active and Raman-active modes are calculated. In addition, the model semiquantitatively describes the influence of hydration on mode frequencies.
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Wittlin et al. (1986) studied this question.
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