Abstract
AbstractThe Rayleigh scattering of Mössbauer radiation has been measured on oriented hydrated fibres of A‐NaDNA. The elastic and inelastic scattering intensities have been determined at different temperatures from 275 to 310 K in the Q range 0.7–3.3 Å−1. The elastic intensity has a main maximum at Q = 1.92 Å−1 due to an ordered structure of water along the DNA double helices. From the temperature dependence of the elastic intensity under the water peak maximum, the mean square displacement of water oxygens in the direction parallel to the DNA axis has been deduced. It varies from 0.110 Å2 at 275 K up to 0.345 Å2 at 310 K. The thermal diffuse scattering intensity is also peaked at the same Q value of the elastic intensity, indicating the presence of coherent vibrational excitations propagating along the ordered water filaments. © 1993 John Wiley & Sons, Inc.
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