Angle-resolved photoelectron spectroscopy of size-selected clusters using synchrotron radiation

使用同步加速器辐射对选定尺寸的团簇进行角分辨光电子能谱

• 批准号: 189888242
• 负责人: Professor Dr. Gerd Ganteför
• 金额: --
• 依托单位: Arbeitsgruppe Clusterphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/189888242?language=en
• 关键词: Angle; resolved; photoelectron; spectroscopy; size

During the first funding period a new method for photoelectron spectroscopy of mass-selected clusters and nanoparticles has been developed and will now be used for measurements. Clusters need to be size-selected prior to an experiment and for this the particles must be charged. Usually, the low target density in an ion beam is compensated by the high intensity of a laser. The maximum photon energy provided by commercial lasers is 7.9 eV restricting this type of experiments to the study of the uppermost occupied orbitals. In contrast, with synchrotron radiation the complete valence bands und even core levels of size-selected clusters could be studied. The problem is the low intensity of synchrotron radiation. During the first funding period, we demonstrated that it is possible to record valence band photoelectron spectra of size selected cluster ions with synchrotron radiation. After this first success, we modified and improved the machine further. At a light intensity of 10**13 photon/s it is now possible to record angle-resolved photoelectron spectra within 10-30 min. Now, the new technique will be used to study the chemisorption of O2, CO and N2 on metal clusters.

在第一个资助期内，已经开发了一种用于质量选择簇和纳米颗粒的光电子能谱的新方法，现在将用于测量。在实验之前，需要对团簇进行尺寸选择，为此，粒子必须带电。通常，离子束中的低目标密度由激光的高强度补偿。商业激光器提供的最大光子能量为7.9 eV，这限制了这种类型的实验对最高占据轨道的研究。与此相反，同步辐射的完整的价带，甚至核心水平的大小选择集群可以研究。问题是同步辐射的强度很低。在第一个资助期内，我们证明了用同步辐射记录大小选择的团簇离子的价带光电子谱是可能的。在第一次成功之后，我们进一步修改和改进了机器。在10**13光子/秒的光强度下，现在可以在10-30分钟内记录角分辨光电子谱。现在，新技术将用于研究O2，CO和N2在金属簇上的化学吸附。