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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Structural rearrangements as relaxation pathway for molecular negative ions formedviavibrational Feshbach resonance
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Structural rearrangements as relaxation pathway for molecular negative ions formedviavibrational Feshbach resonance

机译：作为分子负离子的弛豫途径的结构重排形成血清颤动的Feshbach共振

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摘要

The low-energy (0-15 eV) resonance electron interaction with two organic acids, oxaloacetic and alpha-ketoglutaric, is studied under gas-phase conditions using dissociative electron attachment spectroscopy. The most unexpected observation is the long-lived (microseconds) molecular negative ions formed by thermal electron attachmentviathe vibrational Feshbach resonance mechanism in both compounds. Unlike oxaloacetic acid, for which only one slow (microseconds) dissociative decay is detected, as many as five metastable negative ions are observed for alpha-ketoglutaric acid. These results are analyzed using density functional theory calculations and estimations of electron affinity using the experimental electron detachment times. The results are of considerable interest for understanding the fundamental mechanisms responsible for the dynamics of highly excited negative ions and the transformation pathways of biologically relevant molecules stimulated by excess electron attachment.
机译：使用离解电子连接光谱法在气相条件下研究了与两个有机酸，草臭剂和α-睾丸性的低能量（0-15eV）共振电子相互作用。 最意想不到的观察是通过热电子连接血清形成的长寿命（微秒）分子负离子在两种化合物中的振动Feshbach共振机制形成。 与草乙酸不同，仅检测到一个缓慢（微秒）分离衰减，对于α-酮戊酸，观察到多达五个亚稳定性的负离子。 使用实验电子脱离时间使用密度泛函理论计算和电子亲和力的估计来分析这些结果。 理解负责高兴奋的负离子的动态的基本机制以及通过过量的电子附着刺激的生物相关分子的转化途径，结果是相当大的兴趣。

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