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双电荷的贵族气体集群的尺寸限制和裂变通道

Ianessa Stromberg^1,2, Stefan Bergmeister¹, Lisa Ganner¹

¹Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria. e.gruber@uibk.ac.at.

Physical chemistry chemical physics : PCCP

|April 26, 2024

概括

研究人员使用一种新的方法创建了较小的双电荷原子集群. 这挑战了以前关于裂变障碍的理论,并为研究集群稳定性开辟了新的途径.

科学领域:

物理化学物理化学
原子和分子物理原子和分子物理
纳米级科学科学纳米级科学

背景情况:

高电荷的液滴在雷利极限以下是不稳定的 (裂变参数X>1).
没有小的双电荷原子团离子以前被归因于X=1.1时的无障碍裂变.
现实的模型表明,这种尺寸标志着超过其他解离通道的裂变速率的开始.

研究的目的:

探索一种新的方法来形成小的二元集群.
为了研究双电荷范德瓦尔斯星团的雷利极限.
挑战现有的理论低估原子集群中裂变障碍的理论低估.

主要方法:

在纳米滴中嵌入的单电荷贵重气体 (Ng) 集群的Penning电离.
通过与气的低能碰撞轻松提取二集群.
质量选择的滴度的碰撞激发,以测量碎片离子大小分布.

主要成果:

观察到的二离子贵气 (Ng2+) 离子对于Xe和Kr大约小40%,对于Ar则比以前报告的小20%.
在低碰撞压力下,Dicationic Kr和Xe星团在裂变之前蒸发了原子.
来自小二解Ar集群裂变的碎片分布是双模的.

结论:

该研究成功地产生了较小的二化贵重气体集群,这表明先前的理论研究中低估了裂变障碍.
在Kr和Xe集群中观察到的裂变前的原子蒸发为集群解离路径提供了新的见解.
在Ar集群裂变中的双模块碎片分布表明了纳米级的特定裂变机制.

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