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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ion-Molecule Reactions and Fragmentation Patterns in Helium Nanodroplets
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Ion-Molecule Reactions and Fragmentation Patterns in Helium Nanodroplets

机译：氦纳米液滴中的离子分子反应和碎片化模式

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摘要

A study has been made of the ion chemistry of a series of small molecules that have been embedded in helium nanodroplets.In most instances,the molecules H2O,SO2,CO2,CH3OH,C2H5OH,C3H7OH,CH3F,and CH3Cl have been allowed to form clusters,and reactivity within these has been initiated through electron impact ionization.For two of the molecules studied,CF2C12 and CF3I,reactivity is believed to originate from single molecules embedded in the droplets.Electron impact on the droplets is thought to first create a helium ion,and formation of molecular ions is then assumed to proceed via a charge hopping mechanism that propagates though the droplet and terminates with charge-transfer to a molecule or cluster.The chemistry exhibited by many of the cluster ions and at least one of the single molecular ions is very different from that observed for the same species in isolation.In most cases,reactivity appears to be dominated by high-energy bond breaking processes as opposed to,in the case of the clusters,ion-molecule reactions.Overall,charge-transfer from He~+ does not appear to be a "soft" ionization mechanism.
机译：已经研究了嵌入在氦纳米液滴中的一系列小分子的离子化学性质。在大多数情况下，允许形成H2O，SO2，CO2，CH3OH，C2H5OH，C3H7OH，CH3F和CH3Cl分子团簇，并且其中的反应性已通过电子碰撞电离而引发。对于研究的两个分子CF2C12和CF3I，据认为反应性源自嵌入液滴中的单个分子。电子对液滴的撞击被认为首先产生了氦气然后假定分子离子的形成是通过电荷跳跃机制进行的，该电荷跳跃机制传播通过液滴，并终止于电荷转移至分子或簇。许多簇离子和至少一种单个簇所表现出的化学反应分子离子与隔离中观察到的相同离子有很大不同。在大多数情况下，反应似乎是由高能键断裂过程主导的，而在聚氯乙烯情况下总的来说，He〜+的电荷转移似乎不是“软”电离机制。

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