Abstract:
The TPS 47A High-Resolution Spectroscopy Beamline is a high-brightness hard X-ray beamline constructed as part of the Phase III beamline program at the Taiwan Photon Source (TPS), National Synchrotron Radiation Research Center (NSRRC). It is specifically designed for advanced high-resolution synchrotron spectroscopy and next-generation materials research. The beamline combines high photon flux, high energy resolution, and micrometer-scale beam focusing, thereby meeting the stringent requirements of state-of-the-art hard X-ray spectroscopy experiments.
The TPS 47A2 HAXPES endstation is equipped with a SPECS PHOIBOS 150 NAP hemispherical electron analyzer and a two-dimensional CMOS detector with true pulse-counting capability. This configuration provides high energy resolution, high detection efficiency, and low-noise performance, enabling detailed investigation of buried interfaces, subsurface chemical states, and bulk-sensitive electronic structures.
The system supports both synchrotron radiation and laboratory-based Al Kα and Cr Kα X-ray sources, allowing flexible operation ranging from conventional X-ray photoelectron spectroscopy to hard X-ray photoelectron spectroscopy. This dual-source capability enables multiscale characterization from surface-sensitive to bulk-sensitive regimes. In addition, the modular chamber design, in situ electrical biasing capability, and wide temperature range of 15–1000 K provide a versatile experimental platform for advanced HAXPES studies under various sample environments.
The endstation will be fully integrated with the TPS 47A beamline through a four-bounce high-resolution monochromator, which delivers a narrow-bandwidth hard X-ray beam with excellent energy stability. This configuration will enable high-resolution HAXPES measurements over an energy range of approximately 3.5–10 keV, combining enhanced probing depth, low background noise, and high spectral resolution.
The platform is primarily designed for operando and field-effect-controlled investigations of semiconductor heterostructures, two-dimensional materials, and high-k dielectric interfaces. Future developments will incorporate a broader range of in situ, operando, and device-relevant environments, further strengthening the capability of TPS 47A2 to support next-generation semiconductor, energy, and functional materials research.
Keywords – TPS 47, HAXPES, PES, XPS,