Electron transfer-induced fragmentation of thymine and uracil in atom-molecule collisions

被引：32

作者：

Almeida, D. ^{[1
]}

Antunes, R. ^{[1
]}

Martins, G. ^{[1
]}

Eden, S. ^{[2
]}

da Silva, F. Ferreira ^{[1
]}

Nunes, Y. ^{[1
]}

Garcia, G. ^{[3
,4
]}

Limao-Vieira, P. ^{[1
,2
]}

机构：

[1] Univ Nova Lisboa, Dept Fis, CEFITEC, Lab Colisoes Atom & Mol, P-2829516 Caparica, Portugal

[2] Open Univ, Dept Phys & Astron, Milton Keynes MK7 6AA, Bucks, England

[3] CSIC, Inst Fis Fundamental, E-28006 Madrid, Spain

[4] UNED, Dept Fis Mat, Madrid 28040, Spain

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2011年 / 13卷 / 34期

基金：

英国工程与自然科学研究理事会;

关键词：

NEGATIVE-ION FORMATION; LOW-ENERGY ELECTRONS; DNA BASES; PHOTOELECTRON-SPECTROSCOPY; GAS-PHASE; ATTACHMENT; NITROMETHANE; VALENCE; 5-CHLOROURACIL; DISSOCIATION;

D O I：

10.1039/c1cp21340g

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：

Ion-pair formation has been studied in hyperthermal (30-100 eV) neutral potassium collisions with gas phase thymine (C(5)H(6)N(2)O(2)) and uracil (C(4)H(4)N(2)O(2)). Negative ions formed by electron transfer from the alkali atom to the target molecule were analysed by time-of-flight (TOF) mass spectrometry. The most abundant product anions are assigned to CNO(-) and (U-H)(-)/(T-H)(-) and the associated electron transfer mechanisms are discussed. Special emphasis is given to the enhancement of ring breaking pathways in the present experiments, notably CNO(-) formation, compared with free electron attachment measurements.

引用

页码：15657 / 15665

页数：9

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