Experimental Evidence for the Existence of an Electronically Excited State of the Proposed Dihydrogen Radical Cation He-H-H-He

Jaksch S; da Silva FF; Denifl S; Echt O; Mark TD; Scheier P

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Experimental Evidence for the Existence of an Electronically Excited State of the Proposed Dihydrogen Radical Cation He-H-H-He

机译：提议的二氢自由基阳离子He-H-H-He的电子激发态存在的实验证据

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In a recent report, Uggerud and co-workers (A. Krapp et al., Chem. Eur. J. 2008. 14, 4028) proposed the existence of, a flew class of, radical cations in which a dihydrogen bridges two identical main group elements. Upon electron impact ionization of helium nanodroplets doped with one or more H-2 molecules we observe various HexHy+ cluster ions, including He2H2+, which would belong to the proposed class of radical cations. Mass-analyzed kinetic energy scans reveal that the ion is metastable; it dissociates in the field-free region of the mass spectrometer. One reaction is into HeH2+ + He with a low kinetic energy release of 15 4 meV. Surprisingly, another unimolecular reaction is Observed. into HeH+ + HeH (or He + H). The probability of this reaction is ail order of magnitude higher, and the average kinetic energy release is four times larger. These findings suggest the presence of a metastable electronically excited stated they arc consistent with the proposed linear, centrosymmetric ion structure of He-H-H-He+.

机译：在最近的一份报告中，Uggerud及其同事（A. Krapp等人，Chem。Eur。J. 2008. 14，4028）提出存在一种自由基阳离子，其中二氢桥连两个相同的主离子。组元素。在用一个或多个H-2分子掺杂的氦纳米液滴的电子碰撞电离后，我们观察到各种HexHy +簇离子，包括He2H2 +，它们属于拟议的自由基阳离子类别。质谱分析的动能扫描表明，该离子是亚稳态的。它在质谱仪的无场区解离。一种反应是以15 4 meV的低动能释放到HeH2 + + He中。令人惊讶地，观察到另一单分子反应。变成HeH + + HeH（或He + H）。该反应的可能性高出多个数量级，平均动能释放量大四倍。这些发现表明亚稳电子激发的存在表明它们与提出的He-H-H-He +线性，中心对称离子结构一致。

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《Chemistry: A European journal》 |2009年第16期|共5页
作者
Jaksch S; da Silva FF; Denifl S; Echt O; Mark TD; Scheier P;
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正文语种 eng
中图分类应用化学;
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gas-phase reactions; helium; H-H bond activation; ion-molecule reactions; mass spectrometry;

机译：气相反应氦氢键活化离子分子反应质谱;

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1. Experimental Evidence for the Existence of an Electronically Excited State of the Proposed Dihydrogen Radical Cation He-H-H-He [J] . Jaksch S, da Silva FF, Denifl S, Chemistry: A European journal . 2009,第16期

机译：提议的二氢自由基阳离子He-H-H-He的电子激发态存在的实验证据
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Experimental Evidence for the Existence of an Electronically Excited State of the Proposed Dihydrogen Radical Cation He-H-H-He

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