Laboratory measurements on cold electron reactions with key species of interstellar chemistry using ion beams

使用离子束对星际化学关键物质的冷电子反应进行实验室测量

• 批准号: 203356476
• 负责人: Professor Dr. Stefan Schippers
• 金额: --
• 依托单位: Max-Planck-Institut für Kernphysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/203356476?language=en
• 关键词: Laboratory; measurements; cold; electron; reactions

In the chemical network of the interstellar medium binary reactions involving charged particles (atomic ions, polyatomic molecular ions and electrons) are crucial driving mechanisms at temperatures and densities much below standard laboratory conditions. In order to obtain and improve laboratory data on such processes, event-by-event reaction studies with stored ion beams are proposed on low-energy recombination reactions between ions and electrons in particular. By combining the counting of individual reaction products and the imaging of multiparticle fragmentation with the use of cold photocathode electron beams, such studies have been successfully realized in recent work. For cold ion chemistry processes, however, they hit limitations due to the room-temperature thermal radiation and too short beam storage lifetimes. It is hence proposed to implement the technique at the cryogenic electrostatic storage ring CSR, which will offer much more favorable conditions for the study of processes in cold ion chemistry through the cryogenically cooled surrounding of the ion beam and much longer storage lifetimes. Data will be obtained for dissociative recombination of polyatomic molecular ions with cold electrons at much reduced initial rotational excitation, unaffected by room-temperature thermal radiation, and for dielectronic recombination of heavier singly charged atomic ions with a strongly improved sensitivity for the highly excited Rydberg atoms formed. The project opens up CSR as a unique laboratory for the study of ion chemistry in the interstellar medium.

在涉及带电颗粒（原子离子，多原子分子离子和电子）的星际中二元反应的化学网络中，在温度和密度低于标准实验室条件的密度下，是至关重要的驱动机制。为了获取和改善有关此类过程的实验室数据，提出了与存储的离子束进行的事件反应研究，尤其是离子和电子之间的低能重组反应。通过将单个反应产物的计数和多粒子碎片的成像与使用冷光子电子束的使用相结合，在最近的工作中已经成功实现了此类研究。但是，对于冷离子化学过程，由于室温热辐射和太短的光束储存寿命，它们遇到了局限性。因此，有人提议在低温静电储存环CSR上实施该技术，该技术将通过离子束的低温冷却冷离子化学的过程和更长的存储寿命，为冷离子化学中的过程提供更有利的条件。将获得数据，以大量降低的初始旋转激发，不受室温热辐射的影响，以及对高度激励的原子离子的介电原子离子的介电离子，具有强烈的激发rydberg Atomt Atoms Atomt Atomt Atomt Atomt Atomt Atoms Atomt Atoms Atoms Atoms Atoms，将获得多原子分子离子的解离性重组。形成。该项目将CSR作为一个独特的实验室，用于在星际培养基中研究离子化学。