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.

该项目的目的是在我们的知识中首次证明复杂分子离子在超低动能方面的激光光谱和几乎碰撞的碰撞。冷却复杂分子离子（具有数十原子）的外部自由度，使其温度接近100 mk。使用的方法是通过射频离子陷阱中激光冷却原子离子的交感神经冷却。在这种情况下，分子离子嵌入有序结构（库仑晶体）中，可以将它们储存几分钟到小时。 UVH环境几乎散发出碰撞，这是对率较弱的过程的首次研究。作为一个目标，我们试图在非常低的强度和连续的波照射下确定几种物种的光碎片化速率，即在线性方向上。第二个目标是振动光谱的证明。无法通过荧光进行振动激发的检测，但必须间接检测到。将探索三种不同的技术。适当的测试分子是质子酪氨酸。为了扩大可以光谱的物种的范围，我们将研究两个新方案中交感神经冷却的可行性：（i）非常大的，高，高，高的（质子化的）蛋白质，例如，例如细胞色素-C和Apomyoglobin分子（质量（分别为13000 AMU和（分别为17.000 AMU）），以及（ii）含有过渡金属原子的有机金属络合物，例如羟基苯丙基络合物，后者是寻找违反平等的（PV）影响的兴趣分子。