Hydration dynamics of oriented DNA films investigated by time-domain terahertz spectroscopy

被引：29
作者：
Kistner, C.
Andre, A.
Fischer, T.
Thoma, A.
Janke, C.
Bartels, A.
Gisler, T.
Maret, G.
Dekorsy, T. [1 ]
机构：
[1] Univ Konstanz, Dept Phys, D-78465 Constance, Germany
[2] Univ Konstanz, Ctr Appl Photon, D-78465 Constance, Germany
[3] Univ Strasbourg 1, F-67070 Strasbourg, France
来源：
APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 23期
关键词：
D O I：
10.1063/1.2743401
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The B to A conformational transition of highly oriented DNA films due to a hydration change is observed with time-domain terahertz spectroscopy. Wet-spun films of calf thymus and salmon DNA are investigated for different film thicknesses and for different polarizations of the terahertz radiation relative to the DNA orientation. A clear polarization dependence is observed. Asynchronous optical sampling allows recording of terahertz absorption and background spectra in a few 10 s, permitting the tracking of the dehydration dynamics on a time scale of minutes. The observation of a phase transition is corroborated by Raman spectroscopy. (c) 2007 American Institute of Physics.
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页数：3
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