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首页> 外文期刊>The Journal of Chemical Physics >Charge transfer and fragmentation of liquid helium clusters that contain one or more neon atoms
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Charge transfer and fragmentation of liquid helium clusters that contain one or more neon atoms

机译：包含一个或多个氖原子的液态氦团簇的电荷转移和碎片化

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An investigation of the electron impact ionization and fragmentation of helium clusters that contain Ne atoms and Ne-k subclusters has been performed. The charge transfer probability from He+ to Ne and the branching ratios for fragmentation of the Ne-k subclusters were found by analyzing the dependence of the ion signal intensities on the Ne pressure in the "pickup'' region. The measured charge transfer probability from He+ to Ne ranges from 0.06+/-0.01 for clusters of mean original size [N] = 3300 to 0.43 +/- 0.02 for [N] = 1100, Charge transfer to a single Ne atom within the helium clusters never yields bare Ne+ ions. Instead, fragments of the type NeHen+ are produced. The charge transfer from He+ to Ne-2 subclusters yields mainly Ne-2(+) for smaller initial cluster sizes, but NeHen+ or Ne2Hen+ fragments are more probable for larger clusters. This shows that He droplets of a few thousand atoms are able to cage Ne-2 subclusters by dissipating the entire energy released by charge transfer and formation and vibrational relaxation of the Ne-2(+) ion. Interestingly, it was found that in these relatively small helium clusters the Ne-3 and Ne-4 subclusters never survive the charge transfer from He+. Fragments such as Ne-2(+) and Ne2Hen+ are more likely to survive than are Ne-3(+) and Ne-4(+). In general, the results presented here are qualitatively similar to those for a recent study of the ionization of Ar in helium droplets. In both cases fragmentation to the bare ion is rare, while fragmentation to the dimer ion dominates. However, the helium cluster caging effect is more efficient for Ne subclusters than for Ar subclusters. Also, there is no evidence for shell structures in the NeHen+ ion fragment distributions. (C) 1998 American Institute of Physics; [S0021-9606(98)01748-6]. [References: 26]
机译：已经对包含Ne原子和Ne-k子簇的氦团簇的电子碰撞电离和碎片化进行了研究。通过分析离子信号强度对“拾取”区域中Ne压力的依赖性，可以得出从He +到Ne的电荷转移概率以及Ne-k子簇碎裂的分支比。到Ne的范围从平均原始大小[N] = 3300的簇的0.06 +/- 0.01到[N] = 1100的簇的0.43 +/- 0.02，转移到氦簇中单个Ne原子的电荷永远不会产生裸露的Ne +离子。取而代之的是产生NeHen +类型的碎片，电荷从He +转移到Ne-2子簇时，初始簇尺寸较小时主要产生Ne-2（+），而对于较大的簇，NeHen +或Ne2Hen +碎片更有可能。几千个原子的液滴能够通过耗散通过电荷转移，Ne-2（+）离子的形成和振动弛豫释放的全部能量来笼罩Ne-2子簇。有趣的是，发现在这些相对小的氦簇中Ne-3 an d Ne-4子群永远无法从He +转移电荷。 Ne-2（+）和Ne2Hen +等片段比Ne-3（+）和Ne-4（+）更有可能存活。通常，此处给出的结果在质量上与最近对氦气液滴中Ar的电离的研究相似。在这两种情况下，裸离子的碎裂都是很少的，而二聚体离子的碎裂占主导。但是，氦簇的笼形效应对于Ne子簇比Ar子簇更有效。而且，没有证据表明NeHen +离子片段分布中存在壳结构。 （C）1998年美国物理研究所; [S0021-9606（98）01748-6]。 [参考：26]

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