Summary
We have measured the velocity of acoustic microwave phonons in fibres and films of oriented DNA. The sound velocity is found to be surprisingly isotropic and to decrease substantially during hydration of DNA. No optical modes have been detected in the frequency range covered from 5 to 120 GHz. The photoelastic constants are strongly anisotropic.
Zusammenfassung
Wir haben die Geschwindigkeit akustischer Mikrowellenphononen in Fasern und Filmen orientierter DNS bestimmt. Die Schallgeschwindigkeit ist überraschend isotrop und nimmt mit steigender DNS-Hydration wesentlich ab. Im Frequenzbereich zwischen 5 und 120 GHz konnten keine optischen Moden nachgewiesen werden. Die photoelastischen Konstanten sind stark anisotrop.
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Film I: 1 g NaCl/100 g dry DNA; Film II: 5 g LiCI/100 g dry DNA; Film III: 1 g LiCI/100 g dry DNA.
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Maret, G., Oldenbourg, R., Winterling, G. et al. Velocity of high frequency sound waves in oriented DNA fibres and films determined by Brillouin scattering. Colloid & Polymer Sci 257, 1017–1020 (1979). https://doi.org/10.1007/BF01761112
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DOI: https://doi.org/10.1007/BF01761112