Interatomic Coulombic Decay of clusters upon electron impact

电子撞击时团簇的原子间库仑衰变

• 批准号: 221562919
• 负责人: Professor Dr. Stephan Denifl
• 金额: --
• 依托单位: Institut für Ionenphysik und Angewandte Physik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/221562919?language=en
• 关键词: Interatomic; Coulombic; Decay; clusters; upon

Interatomic Coulombic Decay (ICD) was discovered to be an important phenomenon in the interaction of photons or energetic alpha-particles with clusters. ICD represents in clusters a relaxation mechanism of a single electronic vacancy. Electronic energy may subsequently be transferred into kinetic energy of positive ions and an electron in the continuum. While a plethora of experimental studies using photo-ionization has been carried out in the meantime, no systematic investigations on electron induced ICD exist. We will investigate here if ICD is induced in clusters via inner (valence) shell excitation or ionization by electron impact. Another process studied in this project will be Interatomic Coulombic Electron Capture (ICEC). In this reaction the excess energy deposited in an atom of a cluster by electron capture is released by removal of an electron from a neighbour in the cluster. While detailed theory on this process exists, the experimental verification is eagerly awaited. Moreover, we will study energy harvesting reactions in doped helium droplets which lead to sequential ionization of dopants. The present studies will have strong implications in electron collision physics since new fundamental pathways of electron induced reactions in matter will be elucidated.

原子间库仑衰变 (ICD) 被发现是光子或高能 α 粒子与团簇相互作用的重要现象。 ICD 代表簇中单个电子空位的弛豫机制。电子能随后可以转变为连续体中正离子和电子的动能。虽然同时进行了大量使用光电离的实验研究，但尚未对电子诱导 ICD 进行系统研究。我们将在这里研究 ICD 是否是通过内（价）壳层激发或电子碰撞电离在团簇中诱导的。该项目研究的另一个过程是原子间库仑电子捕获（ICEC）。在该反应中，通过电子捕获而沉积在团簇原子中的多余能量通过从团簇中的相邻原子移除电子而被释放。尽管存在关于这一过程的详细理论，但仍热切期待实验验证。此外，我们将研究掺杂氦液滴中的能量收集反应，这会导致掺杂剂的连续电离。目前的研究将对电子碰撞物理学产生重大影响，因为将阐明物质中电子引发反应的新基本途径。