Optical Parametric Oscillator (OPO)

光参量振荡器 (OPO)

• 批准号: 504504934
• 金额: --
• 依托单位: Universität zu Köln
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2022
• 资助国家: 德国
• 起止时间: 2021-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/504504934?language=en
• 关键词: Optical; Parametric; Oscillator; OPO

The laboratory astrophysics group (AG Schlemmer) develops new methods of molecule spectroscopy. Various radiation sources are used for this purpose. One unique field of research concerns the action spectroscopy of trapped molecular ions which led to publications in Science, Nature, Nature Chemistry and Nature Review Physics. With the help of the requested cw OPO new two color experiments become possible. One (existing) color is used to address a molecular ion such that they are reacting to products which can be distinguished from the parent ion in our ion trap instruments. Since onle y finite ensemble of ions is stored in these experients the fraction of reacting ions and non-reacting ions can be determined and a branching ratio of different parent ions can be measured. Thus structural isomers, conformers and even nuclear spin isomers can be isolated. Via the second color also the other species can be addressed in the same experiment. So they leave the parent ensemble as well. In an experiment with two isomers this could lead to the loss of all parent species from the ensemble. However, when a neutral collision partner is added to the trap inbetween the periods when the light is depleting the ensemble, isomer conversion will happen and not all reactant molecules will be converted. As a result the rate for such a conversion process can be determined. Such fundamental processes, e.g., nuclear spin converion via chemical reactions, can be crucial for the process of star formation out of a molecular cloud. The OPO proposed here will make such experiments possible for the first time. Distinguishing isomers is a topic with large potential for applications (analytics). Two color experiments will also enable to unfold spectra of floppy molecules without a regular structure, e.g. the enigmatic protonated methane molecule.

实验室天体物理学组（AG Schlemmer）开发了分子光谱学的新方法。为此目的使用了各种辐射源。一个独特的研究领域涉及捕获分子离子的作用光谱，并在《科学》、《自然》、《自然化学》和《自然评论物理学》上发表文章。在要求的cw OPO的帮助下，新的两种颜色实验成为可能。一种（现有的）颜色被用来表示一个分子离子，这样它们就会与产物反应，这些产物可以在我们的离子阱仪器中与母离子区分开来。由于在这些实验中只存储有限的离子系综，因此可以确定反应离子和非反应离子的比例，并可以测量不同母离子的分支比。因此可以分离结构异构体、构象甚至核自旋异构体。通过第二种颜色，也可以在同一实验中解决其他物种。所以它们也离开了母体。在两个同分异构体的实验中，这可能导致整体中所有亲本物种的损失。然而，当一个中性的碰撞伙伴被添加到阱中，在光耗尽集合的周期之间，异构体转换将发生，并不是所有的反应物分子都将被转换。因此，可以确定这种转换过程的速率。这些基本过程，例如通过化学反应进行的核自旋转换，对于分子云形成恒星的过程至关重要。这里提出的OPO将首次使这样的实验成为可能。区分异构体是一个具有巨大应用潜力（分析）的主题。两种颜色的实验也将能够展开没有规则结构的松散分子的光谱，例如神秘的质子化甲烷分子。