Electronic energy delocalization and dissipation in single- and double-stranded DNA

被引：159

作者：

Buchvarov, Ivan ^{[1
]}

Wang, Qiang ^{[1
]}

Raytchev, Milen ^{[1
]}

Trifonov, Anton ^{[1
]}

Fiebig, Torsten ^{[1
]}

机构：

[1] Boston Coll, Eugene F Merkert Chem Ctr, Chestnut Hill, MA 02467 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2007年 / 104卷 / 12期

关键词：

excitons; femtosecond; spectroscopy; photophysics;

D O I：

10.1073/pnas.0606757104

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The mechanism that nature applies to dissipate excess energy from solar UV light absorption in DNA is fundamental, because its efficiency determines the vulnerability of all genetic material to photodamage and subsequent mutations. Using femtosecond time-resolved broadband spectroscopy, we have traced the electronic excitation in both time and space along the base stack in a series of single-stranded and double-stranded DNA oligonucleotides. The obtained results demonstrate not only the presence of delocalized electronic domains (excitons) as a result of UV light absorption, but also reveal the spatial extent of the excitons.

引用

页码：4794 / 4797

页数：4

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