Electronic and vibrational excitation in gas phase thymine and 5-bromouracil by electron impact
Electronic and vibrational excitation in gas phase thymine and 5-bromouracil by electron impact
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DOI：
10.1016/j.cplett.2003.09.121
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发表时间：
2003-11-14
影响因子：
2.8
通讯作者：
Dunet, H
中科院分区：
文献类型：
--
作者：
Abouaf, R;Pommier, J;Dunet, H
在胸腺嘧啶（T）和5-溴尿嘧啶（BrU）的最低电子态的激发和振动激发使用EEL光谱（0-100 eV）与角分析的报告。在这两个分子的单重电子态已被发现蓝移了约0.3 eV的紫外-可见吸收的结果相比。在3.6 eV处发现了T的三重态，在3.35 eV处发现了BrU的三重态（+/-0.08 eV）。对于振动激发两个分子显示两个共振区域，约1-2和4-5 eV。在1-2 eV附近激发的模式揭示了羰基，CC双键和NH伸缩模式的激发。在5eV，NH伸缩模式仍然存在，但CO和CC双键伸缩模式少得多的激发。(C)2003 Elsevier B. V.保留所有权利。
In thymine (T) and 5-bromouracil (BrU) the excitation of the lowest electronic states and vibrational excitation using EEL spectroscopy (0-100 eV) with angular analysis is reported. In the two molecules the singlet electronic states have been found blue-shifted by about 0.3 eV compared to the UV-Vis absorption results. Evidence has been found of triplet states at 3.6 eV for T and 3.35 eV for BrU (+/-0.08 eV). For vibrational excitation both molecules show two resonance regions, around 1-2 and 4-5 eV. The modes excited around 1-2 eV reveal an excitation of the carbonyl, CC double bond and NH stretch modes. At 5 eV, the NH stretch modes are still present but CO and CC double bond stretch modes are much less excited. (C) 2003 Elsevier B.V. All rights reserved.