Ground-state spectroscopy of multiply charged anions in the gas phase

气相中多电荷阴离子的基态光谱

• 批准号: 392290622
• 负责人: Dr. Sebastian George
• 金额: --
• 依托单位: Klinik für Kinder- und Jugendmedizin - Allgemeine Pädiatrie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/392290622?language=en
• 关键词: Ground; state; spectroscopy; multiply; charged

Multiply charged anions (MCAs) are common building blocks in condensed phases. Their existence in solids as well as solutions is well established since many decades. Nevertheless, the nature and fundamental properties of isolated MCAs, unaffected by stabilizing counterions and ligands, have been unfathomed due to their fragility in gas-phase experiments. A dedicated experimental program addressing ground state properties of isolated MCAs requires ultra-high vacuum conditions to suppress ion loss of these rarely produced, highly reactive species. Furthermore, lowest blackbody radiation is crucial in order to prevent their destruction by photo-detachment. In my previous work and preliminary studies employing the Cryogenic Trap for Fast ion beams (CTF) and the Cryogenic Storage Ring (CSR) at the Max-Planck-Institut für Kernphysik in Heidelberg I have demonstrated the versatility of electrostatic storage devices at cryogenic temperatures for quasi background-free spectroscopy experiments. For example, the use of laser-induced delayed electron detachment for monitoring precisely the evolution of the internal energy offers new insights into the dynamics of complex molecular systems.With the advent of novel cryogenic storage ring setups experimental studies are mainly limited by an insufficient production of the weakly-bound anionic systems in their rovibrational ground states. Thus, I propose to develop a cryogenic 3-state digital ion trap at the University of Greifswald for creating MCAs in their lowest rovibrational states. This setup will first serve exploring the smallest, extremely weakly bound multiply charged anionic systems. In particular, I will search for the smallest dianionic cluster systems that are stable against electron loss. In a second step, I suggest combining the cryogenic 3-state digital ion trap setup with the CSR in Heidelberg. Here, the ion trap will be used to create, accumulate, and cool bunches of MCAs in their lowest quantum states for injection into CSR. I will study lifetimes, ion-electron interactions, and ion-photon interactions to determine basic aspects such as binding energies and electron-electron correlation effects of MCAs. A key experiment will be the lifetime measurement of the metastable dianionic fullerene C602-. In general these experiments will shed light on the basic properties of MCAs and their role in nature. A successful demonstration of the 3-state ion trap as ion injector will certainly trigger its application in many experiments worldwide.

乘电荷阴离子（MCA）是凝结阶段中的常见构件。自数十年以来，它们在固体和解决方案中的存在。然而，由于它们在气相实验中的脆弱性，因此不受稳定柜台和配体影响的孤立MCA的性质和基本特性一直未受感染。一个针对孤立MCA的基态特性的专用实验程序需要超高的真空条件，以抑制这些很少产生的高反应性物种的离子丢失。此外，最低的黑体辐射对于防止照片破坏而至关重要。在我以前的工作和初步研究中，在海德堡的Max-Planck-InstitutFürKernphysik上采用了快速离子束（CTF）（CTF）和低温存储环（CSR），我已经证明了在哭泣温度下的静电存储设备的多功能性，可用于哭泣的静电设备，以实验酸化的静电温度。例如，使用激光诱导的延迟电子脱离来准确监测内部能量的演变提供了对复杂分子系统动力学的新见解。在新型的低温存储环设置实验研究的前进的情况下，主要受到弱化的弱体性阴离子系统在其Roifibratibal Inbrolational Interational Intation Intation Interational of the Incopational nate的限制。那，我建议在格雷夫斯瓦尔德大学开发一个低温三态数字离子陷阱，以在其最低的旋转状态下创建MCAS。首先，该设置将探索最小，极弱绑定的乘电荷阴离子系统。特别是，我将搜索针对电子损失稳定的最小的硫磺簇系统。在第二步中，我建议将低温三态数字离子陷阱设置与海德堡的CSR相结合。在这里，离子陷阱将用于在其最低量子状态下创建，积累和凉爽的MCA，以注入CSR。我将研究寿命，离子电子相互作用和离子 - 光子相互作用，以确定MCAS的基本方面，例如结合能和电子电子相关效应。一个关键的实验将是亚稳态的硫烯富勒烯C602-的终生测量。通常，这些实验将阐明MCA的基本特性及其在自然界中的作用。由于离子注入的三态离子陷阱的成功证明肯定会触发其在全球许多实验中的应用。