Very high resolution photoelectron spectroscopy on deeply cold gold cluster anions

金团簇由于其奇特的性质而引起了人们的极大兴趣，这些性质与相对论效应在其原子间成键中的强烈影响密切相关。金团簇阴离子的光电子能谱有助于揭示较小团簇的许多有趣的性质，但对于20个以上原子的团簇，由于分辨率有限和理论必须可靠地模拟光电子光谱的困难，这两个问题都受到了阻碍。最近，在金团簇的理论处理方面取得了突破性进展；现在需要更高分辨率的光电子能谱来充分利用这一进展。我们开发了一种新版本的磁瓶光谱仪，其分辨率显著提高，与团簇的低温冷却相结合，可以获得前所未有的质量的光谱。我们建议用同分异构体敏感的方法对尺寸选择的金团簇阴离子进行全面的研究，结合新的理论结果，这将使我们更好地理解这些团簇的几何和电子结构，以及光电发射的动态方面，如空穴寿命。

Gold clusters are attracting significant interest due to their often exotic properties, which are closely linked to the strong influence of relativistic effects in their interatomic bonding. Photoelectron spectroscopy on gold cluster anions has helped to unveil many interesting properties of smaller clusters, but for clusters with more than 20 atoms was hampered both by finite resolution and the difficulties theory had to simulate photoelectron spectra reliably. Very recently a breakthrough has been achieved in the theoretical treatment of gold clusters; now much better resolved photoelectron spectra are needed to fully exploit this progress. We have developed a new version of a magnetic bottle spectrometer with a significantly improved resolution, which in combination with cryogenic cooling of the clusters could be used to obtain spectra of unprecedented quality. We propose to perform a comprehensive study of size-selected gold cluster anions using isomer-sensitive methods, which in combination with the new theoretical results will lead to a much better understanding of the geometric and electronic structure of these clusters, as well as of dynamic aspects of the photoemission like hole lifetimes.