Dissoziation dynamics of core-excited ionic molecular radicals

核激发离子分子自由基的解离动力学

• 批准号: 510114039
• 负责人: Privatdozent Dr. Michael Martins
• 金额: --
• 依托单位: Institut für Experimentalphysik
• 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/510114039?language=en
• 关键词: Dissoziation; dynamics; core; excited; ionic

Within the project we will investigate the photoionisation and dissociation dynamics in isolated, chemical reactive, ionic molecular radicals following a site specific core excitation using soft x-rays. For this a unique combination of an intense molecular ion beam and tunable synchrotron radiation will be applied. Molecular ions are particularly interesting as they allow us to prepare well defined molecular radicals via their mass-over-charge ratio and to study their electronic structure via soft-x-ray absorption spectroscopy.Here we will go a step further and study also completely unexplored dynamic processes in molecular radicals by differential X-ray absorption by measuring the kinetic-energy-release (KER) of photo fragments. These KER resolved experiments will allow us to address especially ultrafast dissociation processes on the timescale of a few femtoseconds in radicals.The focus will be on diatomic molecules with one hydrogen atom and the corresponding deuterated molecules, as in these molecules an ultrafast dissociation can be expected. The results will be relevant also for other fields of research. The applicability of the method for larger molecules will be tested for one three atomic molecule.

在该项目中，我们将调查的光电离和解离动力学在孤立的，化学反应，离子分子自由基后，使用软x射线的网站特定的核心激发。为此，将应用一种独特的强分子离子束和可调谐同步辐射的组合。分子离子是特别有趣的，因为它们允许我们通过它们的质荷比来制备定义明确的分子自由基，并通过软X射线吸收光谱来研究它们的电子结构。在这里，我们将更进一步，通过测量光碎片的动能释放（KER），通过差分X射线吸收来研究分子自由基中完全未知的动力学过程。这些KER解析实验将使我们能够解决自由基中几个飞秒时间尺度上的超快解离过程。重点将放在具有一个氢原子的双原子分子和相应的氘化分子上，因为在这些分子中可以预期超快解离。其结果也将与其他研究领域有关。该方法对较大分子的适用性将针对一个三原子分子进行测试。