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Rayleigh scattering of Mössbauer radiation in hydrated oriented DNA fibers
Author(s) -
Albanese G.,
Deriu A.,
Cavatorta F.,
Rupprecht A.
Publication year - 1993
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.360330412
Subject(s) - chemistry , rayleigh scattering , intensity (physics) , scattering , molecular physics , mössbauer spectroscopy , crystallography , atomic physics , optics , physics
The 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 Å 2 at 275 K up to 0.345 Å 2 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.