报告题目：The Infrared Free-Electron Laser at the Fritz Haber Institute:
A Tool for IR Spectroscopy of Molecules, Clusters, and Solids
报告人： Wieland Schöllkopf 教授
德国Fritz-Haber 研究所
时 间： 3月25日（周五) 上午10:30-11:45
地 点： 卢嘉锡楼报告厅（202）
以下是报告的摘要部分：
Abstract:
At the Fritz Haber Institute (FHI) in Berlin, Germany, we operate a mid-infrared free-electron laser (FEL). The FEL is driven by an electron accelerator providing a final electron energy adjustable from 15 to 50 MeV. Pulsed radiation with up to 100 mJ pulse energy at about 0.5% relative bandwidth is routinely produced in the wavelength range from 3 to 48 μm. We will describe the FEL design and its performance and give an overview of the FHI FEL facility [1].
In addition, we will present selected results recently gained with the FHI FEL in three different fields: (1) spectroscopy of bio-molecules (saccharides, peptides and small proteins) in the gas phase or embedded in superfluid helium nano-droplets at 0.4 K [2]; (2) spectroscopy of mass-selected metal and metal-oxide clusters as well as protonated water clusters in the gas phase [3]; and (3) second-harmonic generation (SHG) spectroscopy of solids and nanostructures [4].
[1] W. Schöllkopf et al., Proc. of SPIE 9512, 95121L (2015), http://dx.doi.org/10.1117/12.2182284.
[2] A. I. González Flórez et al., Angew. Chem. Int. Ed., in press, ttp://dx.doi.org/10.1002/anie.201510983.
[3] J. A. Fournier et al., PNAS 111, 18132 (2014), http://dx.doi.org/10.1073/pnas.1420734111.
[4] A. Paarmann et al., Appl. Phys. Lett. 107, 081101 (2015), http://dx.doi.org/10.1063/1.4929358.
