Electron attachment to the DNA bases thymine and cytosine

被引：141
|
作者：
Denifl, S [1 ]
Ptasinska, S [1 ]
Cingel, M [1 ]
Matejcik, S [1 ]
Scheier, P [1 ]
Märk, TD [1 ]
机构：
[1] Univ Innsbruck, Inst Ionenphys, A-6020 Innsbruck, Austria
来源：
CHEMICAL PHYSICS LETTERS | 2003年 / 377卷 / 1-2期
关键词：
D O I：
10.1016/S0009-2614(03)01096-0
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Electron attachment (EA) to the DNA bases thymine (T) and cytosine (C) was studied in the electron energy range from about 0 to 9 eV using a crossed electron/molecule beams technique. As uracil the dominant negative ions formed via EA reactions to T and C are (T - H)(-) (corresponding to T minus H, with a mass to charge ratio of 125) and (C - H)(-) (corresponding to C minus H with a mass to charge ratio of 110). The respective partial EA cross-sections for (T - H)(-) and (C - H)(-) could be determined yielding peak values of sigma (1.05 eV) = 1.2 x 10(19) m(2), sigma (1.54 eV) = 2.3 x 10(-10) m(2), respectively. (C) 2003 Elsevier B.V. All rights reserved.
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页码：74 / 80
页数：7
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