Development of time-resolved photoelectron spectroscopy system

Shang-Hsien Hsieh^1*, Chia-Hao Chen^1,2, Ping-Hui Lin¹, Ming-Chang Chen³, Chih-Wei Luo^1,2

¹National Synchrotron Radiation Research Center, Hsinchu, Taiwan
²Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
³Institute of Photonics Technologies, National Tsing Hua University, Hsinchu, Taiwan

* Presenter:Shang-Hsien Hsieh, email:hsieh.steven@nsrrc.org.tw

The National Synchrotron Radiation Research Center (NSRRC) has undertaken the construction of an Ultra-High Vacuum X-ray Photoelectron Spectroscopy (UHV-XPS) end-station for the TPS 43A1 beamline, dedicated to investigating the rapid dynamic processes in advanced materials. The TPS 43A beamline will host three experimental end-stations in tandem: UHV-XPS for conventional XPS and Time-Resolved Photoelectron Spectroscopy (Tr-PES), along with two Ambient Pressure XPS (APXPS I and II) for experiments at ambient pressure. The primary chamber of the UHV-XPS end-station will incorporate dual analyzers from SPECS GmbH, the PHOIBOS 225 hemispherical analyzer and the THEMIS 1000 Time-of-Flight Spectrometer, facilitating a diverse range of measurements including XPS, Tr-PES, and Auger electron-Photoelectron coincident spectroscopy (APECS) within a single system. The beamline features a high-resolution, high-flux undulator with a bendable active mirror (AM) and plane gratings (PG), covering an energy range from 200 to 3000 eV and delivering an average photon flux of 1x1013 photons/s. This setup ensures an energy resolving power of at least 10,000 across the entire energy range. The focused beam size for the UHV-XPS is 9(H) x 5(V) μm2, while for APXPS stations I and II, the sizes are 23(H) x 9(V) μm2 and 37(H) x 12(V) μm2, respectively, allowing for precise and detailed material analysis.

Keywords: X-ray Photoelectron Spectroscopy, Synchrotron Radiation, Time-Resolved Photoelectron Spectroscopy, Auger electron-Photoelectron coincident spectroscopy