Dipole relaxation losses in DNA

被引：28

作者：

Briman, M ^{[1
]}

Armitage, NP ^{[1
]}

Helgren, E ^{[1
]}

Grüner, G ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

来源：

NANO LETTERS | 2004年 / 4卷 / 04期

关键词：

D O I：

10.1021/nl049961s

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The electrodynamic response of DNA in the millimeter wave range is investigated. By performing measurements under a wide range of humidity conditions and comparing the response of single-stranded DNA and double-stranded DNA, we show that the appreciable ac conductivity of DNA is not due to photon-assisted hopping between localized states but is instead due to dissipation from dipole motion in the surrounding water helix. Such a result, where the conductivity is due to the constrained motion of overdamped dipoles, reconciles the vanishing dc conductivity of DNA with the considerable ac response.

引用

页码：733 / 736

页数：4

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