Resonance electron capture by serine.
Resonance electron capture by serine.
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DOI：
10.1021/jp906636b
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发表时间：
2010-02
期刊：
影响因子：
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通讯作者：
J. Kočišek;P. Papp;P. Mach;Y. Vasil’ev;M. Deinzer;Š. Matejčík
中科院分区：
文献类型：
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作者：
J. Kočišek;P. Papp;P. Mach;Y. Vasil’ev;M. Deinzer;Š. Matejčík
用两种不同的交叉电子/分子束技术和量子化学计算研究了气相中氨基酸丝氨酸通过解离电子附着（DEA）形成负离子的过程。测量了16个负离子在0 ~ 11 eV电子能量范围内的共振电子俘获质谱和有效离子产额曲线。从丝氨酸的负离子被检测到从共振状态在0，1.3，5，和8 eV附近。在低电子能量下，主要反应通道为（M-H）（-）。该离子的相对截面超过任何其他碎片负离子的20倍以上。采用高分辨实验研究了（M-H）（-）截面的精细结构。我们已经发现，第二个OH基团影响一些解离通道。应用量子化学计算解释了DEA反应通道的产物。
Formation of negative ions via dissociative electron attachment (DEA) to the amino acid serine in the gas phase was studied using two different crossed electron/molecular beam techniques and quantum chemical calculations. Resonance electron capture mass spectrum and effective ion yield curves of 16 negative ions were measured over the electron energy range from close to 0 to 11 eV. The negative ions from serine were detected from resonance states in the vicinity of 0, 1.3, 5, and 8 eV. The dominant reaction channel at low electron energies was (M-H)(-). The relative cross section for this ion exceeds more than 20 times that of any other fragment negative ions. A high-resolution experiment was applied to study fine structures in (M-H)(-) cross section. We have found that the second OH group influences some dissociative channels. Quantum chemical calculations were applied to interpret products of the DEA reaction channels.