A High Repetition Rate 193 nm Excimer Laser for the Production of Reactive Cold Molecules

氦纳米液滴分离光谱已成为稳定和研究不稳定物质的通用工具。更引人注目的是使用氦滴作为纳米反应器。为此，氦纳米液滴，由几千到几百万个氦原子组成，可以掺杂活性物质。在400 mK的极低温度下，如果没有势垒，或者存在低势垒，或者可以光诱导，则会发生化学反应。利用氦纳米液滴光谱学的方法研究大气和天体物理相关的化学反应，是一个很有前途的研究项目。我们特别感兴趣的是涉及OH自由基的反应，它作为地球大气的“真空吸尘器”起着特别重要的作用。

Helium nanodroplet isolation spectroscopy has become a versatile tool for the stabilization and study of unstable species. Even more remarkable is the use of helium droplets as nanoreactors. For this purpose, helium nanodroplets, which consist of several thousand up to several million helium atoms, can be doped with reactive species. At the very low temperature of 400 mK, a chemical reaction will occur if it is barrier-less or through a tunnelling mechanism if a low barrier exists or it can be photo-induced. We have developed a promising research program to study chemical reactions of atmospheric and astrophysical relevance using the method of helium nanodroplet spectroscopy. Of particular interest to us are reactions involving the OH radical, which plays a particularly important role as Earth's atmospheric "vacuum cleaner".