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Spectroscopy of trapped ultracold complex molecular ions

捕获的超冷复合分子离子的光谱

基本信息

批准号：
84231855
负责人：
Professor Stephan Schiller, Ph.D.
金额：
--
依托单位：
Institut für Experimentalphysik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/84231855?language=en
关键词：
Spectroscopy trapped ultracold complex molecular

项目摘要

The aim of this project is to demonstrate, for the first time to our knowledge, laser spectroscopy of complex molecular ions in the regime of ultralow kinetic energy and in a near-absence of collisions.Very recently, we have demonstrated that it is possible to cool the external degrees of freedom of complex molecular ions (with tens of atoms) to temperatures near 100 mK. The employed method is sympathetic cooling by laser-cooled atomic ions in a radiofrequency ion trap. Under such conditions, the molecular ions are embedded in ordered structures (Coulomb crystals), where they can be stored for several minutes up to hours. The UVH environment provides near-absence of collisions, enabling, for the first time, the study of processes with weak rates. As one goal, we seek to determine the photofragmentation rates of several species at very low intensities and continuous-wave irradiation, i.e. in the linear regime.A second goal is the demonstration of vibrational spectroscopy. The detection of a vibrational excitation cannot be performed via fluorescence, but has to be detected indirectly. Three different techniques will be explored to this end. An appropriate test molecule is protonated tyrosine.In order to enlarge the range of species that can be spectroscopied, we will investigate the feasibility of sympathetic cooling in two new regimes: (i) very large, highly-charged (protonated) proteins, such as, e.g. Cytochrome-C and Apomyoglobin molecules (mass (13000 amu and (17.000 amu, respectively), and (II) organometallic complexes containing transition metal atoms, e.g. oxorhenium complexes. The latter are of interest for the search for parity violating (PV) effects in molecules.

该项目的目的是展示，第一次，我们所知道的，在超低动能和几乎没有碰撞的情况下，复杂分子离子的激光光谱。最近，我们已经证明，它是可能的复杂分子离子（与几十个原子）的外部自由度冷却到接近100 mK的温度。所采用的方法是在射频离子阱中用激光冷却原子离子进行共振冷却。在这种条件下，分子离子嵌入有序结构（库仑晶体）中，它们可以在其中存储数分钟至数小时。UVH环境提供了几乎没有碰撞的情况，这是第一次能够研究具有弱速率的过程。作为一个目标，我们寻求确定几个物种在非常低的强度和连续波照射下（即线性区域）的光碎裂速率。第二个目标是振动光谱的演示。振动激发的检测不能通过荧光进行，而必须间接检测。为此，将探索三种不同的技术。合适的测试分子是质子化酪氨酸。为了扩大可以光谱分析的物质范围，我们将研究两种新方案中交感神经冷却的可行性：（一）非常大，高度带电（质子化）蛋白质，例如细胞色素-C和脱辅基肌红蛋白分子（质量）（分别为13000 amu和17.000 amu），和（II）含有过渡金属原子的有机金属配合物，例如氧合铼配合物。后者是感兴趣的宇称违反（PV）的影响在分子中的搜索。