AP-XPS beamline, a platform for operando science at Pohang Accelerator Laboratory

Journal of Synchrotron Radiation
Geonhwa KimKi Jeong Kim

Abstract

Beamline 8A (BL 8A) is an undulator-based soft X-ray beamline at Pohang Accelerator Laboratory. This beamline is aimed at high-resolution ambient-pressure X-ray photoelectron spectroscopy (AP-XPS), soft X-ray absorption spectroscopy (soft-XAS) and scanning photoemission microscopy (SPEM) experiments. BL 8A has two branches, 8A1 SPEM and 8A2 AP-XPS, that share a plane undulator, the first mirror (M1) and the monochromator. The photon beam is switched between the two branches by changing the refocusing mirrors after the monochromator. The acceptance angle of M1 is kept glancing at 1.2°, and Pt is coated onto the mirrors to achieve high reflectance, which ensures a wide photon energy range (100-2000 eV) with high resolution at a photon flux of ∼1013 photons s-1. In this article, the main properties and performance of the beamline are reported, together with selected experiments performed on the new beamline and experimental system.

References

Jul 30, 2002·Physical Review Letters·B L M Hendriksen, J W M Frenken
Aug 11, 1978·Science·G A Somorjai
Mar 22, 2008·Angewandte Chemie·Gerhard Ertl
Jun 2, 2014·The Review of Scientific Instruments·I HwangMoohyun Cho
May 15, 2019·Nano Letters·Seong-Jun YangCheol-Joo Kim

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Citations

Mar 2, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Curran KalhaAnna Regoutz

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Methods Mentioned

BETA
X-ray

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