Studies of unusual simple molecules by neutralization-reionization mass spectrometry.

Studies of unusual simple molecules by neutralization-reionization mass spectrometry.
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通过中和-再电离质谱法研究不寻常的简单分子。

DOI:
10.1126/science.2305261
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发表时间:
1990
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
McLafferty,FW
McLafferty,FW
中科院分区:
--
文献类型:
--
作者:
McLafferty,FW

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反应性或不稳定分子是许多重要反应的关键中间体,但很难准备用于实验研究。缺少(:CH- oh)或多余(H3)取代基的物质通常可以在气相中通过中和一束更稳定的离子(CH = O+H, H3+)而方便地形成。中性在~ 10-6秒后再电离测试其稳定性,而其单分子化学可以通过用不同数量的内能制备来探测。产生的中性产物被再电离并进行质量分析。然后通过离子解离和第三个质量分析步骤来表征同分异构体。许多不寻常的分子已经用这种技术表征,它也可以用来探测复杂的单分子化学,如环丁二烯和环氧乙烷。
Reactive or unstable molecules are key intermediates in many important reactions, but can be difficult to prepare for experimental studies. Species with missing (:CH-OH) or extra (H3) substituents can often be formed conveniently in the gas phase by neutralizing a beam of a more stable ionic counterpart (CH = O+H, H3+). Reionization of the neutral after ∼ 10-6seconds tests its stability, whereas its unimolecular chemistry can be probed by preparing it with different amounts of internal energy. The resulting neutral products are reionized and mass analyzed. Isomers are then characterized by ion dissociation and a third mass-analysis step. Many unusual molecules have been characterized with this technique, which can also be used to probe complex unimolecular chemistry, such as that of cyclobutadiene and ethylene oxide.
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