Investigation of intermolecular Coulombic decay in carbon-based molecular clusters upon low-energy electron-impact

低能电子撞击碳基分子簇分子间库仑衰变的研究

• 批准号: 458472603
• 负责人: Dr. Woon Yong Baek, since 7/2023
• 金额: --
• 依托单位: Physikalisch-Technische Bundesanstalt (PTB)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/458472603?language=en
• 关键词: Investigation; intermolecular; Coulombic; decay; carbon

The primary goal of this project is to investigate the basic atomic and molecular processes involved in the interaction of low-energy (10 - 100 eV) electrons (LEE) with molecular aggregates (clusters) of biological relevance. In particular, we study outer-valence and inner-valence ionization and the subsequent ultra-fast energy dissipation processes involving neighboring molecules via intermolecular Coulombic decay (ICD) process. Although not well recognized these processes play an important role in radiation damage of biological tissue following the interaction with ionizing radiation. Recently we could demonstrate the existence of ICD in a hydrogen bonded dimer consisting of water and tetrahydrofuran (THF). (Ren, X. et al., 2018, Nature Physics 14, 1062). ) THF is a model system for deoxyribose in DNA. The logical next steps and, thus, the central goals of the present application are to proof the existence of ICD in purely carbon based organic molecular clusters. Moreover, to assess their relevance in radiation damage the relative contribution of ICD processes to molecular ionization will be measured. The main target species studied will span different organic molecules and include benzene dimers (C6H6)2 and pyrimidine dimers (C4H4N2)2. This project applies energy resolved electron impact ionization and momentum resolved multi-particle detection techniques (reaction microscopes). The targets are produced in seeded supersonic jet expansions.

该项目的主要目的是研究低能（10-100 eV）电子（LEE）与生物学相关性的分子聚集体（簇）相互作用所涉及的基本原子和分子过程。特别是，我们研究了外部价值和内部价电离以及随后通过分子间库仑衰变（ICD）过程涉及邻近分子的超快速耗散过程。尽管不太识别这些过程在与电离辐射的相互作用后，这些过程在生物组织的辐射损伤中起重要作用。最近，我们可以证明ICD在由水和四氢呋喃（THF）组成的氢键二聚体中的存在。 （Ren，X。等，2018，自然物理学14，1062）。 ）THF是DNA中脱氧核糖的模型系统。逻辑下一步，因此，本应用的核心目标是证明ICD在纯碳基有机分子簇中的存在。此外，要评估它们在辐射损伤中的相关性，将测量ICD过程对分子电离的相对贡献。研究的主要靶物质将跨越不同的有机分子，包括苯二聚体（C6H6）2和嘧啶二聚体（C4H4N2）2。该项目采用能量解析的电子冲击电离和动量解析多粒子检测技术（反应显微镜）。靶标在种子超音速射流膨胀中产生。