Penning Ionization of Acene Molecules by Helium Nanodroplets.

Penning Ionization of Acene Molecules by Helium Nanodroplets.
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氦纳米液滴对并苯分子的潘宁电离

DOI:
10.1021/acs.jpca.7b12506
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发表时间:
2018
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
M. Shcherbinin
M. Shcherbinin
中科院分区:
--
文献类型:
--
作者:
M. Shcherbinin

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并苯分子(蒽、并四苯、并五苯)和富勒烯 (C) 嵌入 He 纳米液滴 (He) 中,并通过 EUV 同步加速器辐射进行探测。当共振激发 He 纳米液滴时,嵌入的分子 M 通过潘宁反应被有效电离。然而,潘宁电子谱很宽且无结构——与二元潘宁碰撞测量的谱图和与氦液滴表面结合的掺杂剂测量的谱图都没有相似之处。所有四个光谱的相似性表明嵌入物质的电子光谱被电子-He 散射显着改变。基于弹性二元电子-He 碰撞的模拟定性地再现了测量的光谱,但需要假设意外大的 He 液滴。
Acene molecules (anthracene, tetracene, pentacene) and fullerene (C) are embedded in He nanodroplets (He) and probed by EUV synchrotron radiation. When resonantly exciting the He nanodroplets, the embedded molecules M are efficiently ionized by the Penning reaction. However, the Penning electron spectra are broad and structureless -- showing no resemblance neither with those measured by binary Penning collisions, nor with those measured for dopants bound to the He droplet surface. The similarity of all four spectra indicates that electron spectra of embedded species are substantially altered by electron-He scattering. Simulations based on elastic binary electron-He collisions qualitatively reproduce the measured spectra, but require the assumption of unexpectedly large He droplets.
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