Non-bonding molecular spinors and tests of fundamental physics with laser-cooled ions

非键合分子自旋子和激光冷却离子的基础物理测试

• 批准号: 445296313
• 负责人: Professor Dr. Robert Berger
• 金额: --
• 依托单位: B.P. Konstantinova Petersburg Nuclear Physics Institute
• 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/445296313?language=en
• 关键词: Non; bonding; molecular; spinors; tests

By definition, a non-bonding molecular orbital is an orbital, for which removal or addition of an electron does not change the chemical bond strength. At the same time, electrons on non-bonding molecular orbitals/spinors (NBMS) are of crucial importance for a wealth of physical applications, e.g., recent progress in direct laser cooling of molecules, including polyatomic ones, is essentially connected with understanding of the role of non-bonding spinors in the creation of closed cooling cycles, required for a molecule to be able to re-scatter thousands of photons. Laser-cooled molecules/ions can then be used for numerous other fundamental applications, such as the search for a permanent electron electric dipole moment and the measurement of the nuclear Schiff moment. Identification of molecules with desired properties (e.g. laser-coolability and sensitivity to nuclear Schiff moment) is challenging though, particularly it requires fundamental understanding of the peculiarities of the molecular electronic structure with electrons occupying NBMS. Despite the importance of NBMS, they have not been in the center of theoretical and experimental studies until recent years. We have defined previously certain classes of NBMS and identified subsequently molecules amenable for laser cooling possessing one or another type of NBMS. In this project we plan to undertake a systematic theoretical study of the particular role of NBMS in electronic structure of charged molecules. Special attention will be given on the one hand to the fundamental theory of NBMS and on the other hand to diverse applications such as laser cooling, search for exotic cosmic fields (including cold dark matter) and tests of QED effects in molecular ions. Laser-cooled molecular cations can be used subsequently in sympathetic cooling of other ions.

根据定义，非键分子轨道是电子的移除或添加不会改变化学键强度的轨道。同时，非键分子轨道/旋量(NBM)上的电子对于丰富的物理应用是至关重要的，例如，包括多原子分子在内的分子直接激光冷却的最新进展本质上与理解非键旋量在创建闭合冷却循环中的作用有关，这是分子能够重新散射数千个光子所必需的。然后，激光冷却的分子/离子可以用于许多其他基本应用，例如搜索永久电子电偶极矩和测量核Schiff矩。然而，识别具有所需性质(例如，激光冷却性和对核Schiff矩的敏感性)的分子是具有挑战性的，特别是它需要从根本上理解电子占据NBMS的分子电子结构的特性。尽管NBMS很重要，但直到最近几年，它们才成为理论和实验研究的中心。我们以前已经定义了某些类型的NBMS，并随后确定了具有一种或另一种类型的NBMS的可用于激光冷却的分子。在这个项目中，我们计划对NBMS在带电分子的电子结构中的特殊作用进行系统的理论研究。一方面将特别关注NBMS的基本理论，另一方面将特别关注各种应用，如激光冷却、寻找奇异的宇宙场(包括冷暗物质)和分子离子中QED效应的测试。激光冷却的分子阳离子随后可用于其他离子的共鸣冷却。