Formation and spectroscopy of alkali molecules and clusters in helium nanodroplets

氦纳米液滴中碱分子和团簇的形成和光谱

• 批准号: 5407186
• 负责人: Professor Dr. Frank Stienkemeier
• 金额: --
• 依托单位: Arbeitsgruppe Molekül- und Nanophysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5407186?language=en
• 关键词: Formation; spectroscopy; alkali; molecules; clusters

Alkali molecules and clusters are formed upon successive pick-up and agglomeration in helium nanodroplets at a temperature around 380 mK. Laser spectroscopy is applied to study pure and mixed clusters as well as clusters with adsorbates. In particular, absorption and resonant enhanced ionization properties of mixed alkali dimers (LiCs, RbCs) will be investigated to develop efficient detection schemes for such molecules isolated in traps. Furthermore, the formation of large spin-polarized alkali clusters and their binding and depolarization properties are examined probing electronic excitations and interactions with external magnetic fields. Finally, laser-induced fluorescence and accordingly beam depletion spectroscopy is applied to alkali clusters in order to study collective excitations (plasmon resonances) at very low temperatures.

在380MK左右的温度下，在氦纳米液滴中连续拾取和聚集形成碱分子和团簇。激光光谱学被用来研究纯团簇、混合团簇以及带有吸附的团簇。特别是，混合碱二聚体(LICs，RBC)的吸收和共振增强电离特性将被研究，以开发有效的检测方案，以隔离在陷阱中的此类分子。此外，通过探测电子激发和与外加磁场的相互作用，研究了大自旋极化碱团簇的形成及其结合和退极化性质。最后，将激光诱导荧光光谱和相应的光束耗尽光谱应用于碱金属团簇，以研究在极低温度下的集体激发(等离子体共振)。