自由团簇和纳米液滴极紫外光谱的新终端站
A new endstation for extreme-ultraviolet spectroscopy of free clusters and nanodroplets
摘要：
我们提出了一个新的终端站的AMOLine的ASTRID 2同步加速器在奥胡斯大学，它结合了一个集群和纳米液滴光束源的速度图成像和飞行时间光谱仪符合成像光谱。自由纳米粒子的极紫外光谱是研究共振激发或电离的纳米尺度凝聚相体系的光物理和光化学的有力工具。在这里，我们证明了这种能力进行光电子-光离子符合（PEPICO）实验与纯和掺杂的超流氦纳米液滴。不同的掺杂选择和束源提供了一个通用的平台，以产生各种范德华簇以及He纳米液滴。我们提出了一个详细的表征的新的设置，并提出了它的使用的例子，用于测量高分辨率的带电粒子，飞行时间离子质谱，阴阳离子符合光谱，多符合电子光谱和角分布的产率谱。这个新的终端站的研究的一个特别重点是在异质纳米系统的价壳层激发和电离诱导的分子间电荷和能量转移过程。
英文摘要：
We present a new endstation for the AMOLine of the ASTRID2 synchrotron at Aarhus University, which combines a cluster and nanodroplet beam source with a velocity map imaging and time-of-flight spectrometer for coincidence imaging spectroscopy. Extreme-ultraviolet spectroscopy of free nanoparticles is a powerful tool for studying the photophysics and photochemistry of resonantly excited or ionized nanometer-sized condensed-phase systems. Here we demonstrate this capability by performing photoelectron-photoion coincidence (PEPICO) experiments with pure and doped superfluid helium nanodroplets. Different doping options and beam sources provide a versatile platform to generate various van der Waals clusters as well as He nanodroplets. We present a detailed characterization of the new setup and present examples of its use for measuring high-resolution yield spectra of charged particles, time-of-flight ion mass spectra, anion-cation coincidence spectra, multi-coincidence electron spectra and angular distributions. A particular focus of the research with this new endstation is on intermolecular charge and energy-transfer processes in heterogeneous nanosystems induced by valence-shell excitation and ionization.
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