Far-infrared spectroscopy on oriented films of dry and hydrated DNA

A. Wittlin, L. Genzel, F. Kremer, S. Häseler, A. Poglitsch, and A. Rupprecht
Phys. Rev. A 34, 493 – Published 1 July 1986
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Abstract

Far-infrared measurements, between 3 and 450 cm1, of absorption spectra of highly oriented films of Li-DNA and Na-DNA in the temperature range 5300 K are reported. Five low-frequency infrared-active vibrational modes are observed. The lowest infrared-active mode at 45 cm1 for Li-DNA and 41 cm1 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 cm1 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.

  • Received 2 December 1985

DOI:https://doi.org/10.1103/PhysRevA.34.493

©1986 American Physical Society

Authors & Affiliations

A. Wittlin, L. Genzel, F. Kremer, S. Häseler, and A. Poglitsch

  • Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, Postfach 80??, D-7000 Stuttgart 80, Federal Republic of Germany

A. Rupprecht

  • Department of Physical Chemistry, University of Stockholm, Arrhenius Laboratory, S-106? Stockholm, Sweden

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Vol. 34, Iss. 1 — July 1986

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