Performance of a photoelectron momentum microscope in direct‐ and momentum‐space imaging with ultraviolet photon sources

The Photoelectron‐Related Image and Nano‐Spectroscopy (PRINS) endstation located at the Taiwan Photon Source beamline 27A2 houses a photoelectron momentum microscope capable of performing direct‐space imaging, momentum‐space imaging and photoemission spectroscopy with position sensitivity. Here, the...

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Bibliographic Details
Published in:Journal of synchrotron radiation 2024-01, Vol.31 (1), p.195-201
Main Authors: Chuang, Tzu-Hung, Hsu, Chuan-Che, Chiu, Wei-Sheng, Jhuang, Jyun-Syong, Yeh, I-Chun, Chen, Ruei-San, Gwo, Shanjr, Wei, Der-Hsin
Format: Article
Language:English
Subjects:
Beamlines
electronic structure
Energy resolution
Fermi contour
Imaging
Momentum
momentum microscope
Photoelectric emission
Photoelectron spectroscopy
Photoelectrons
photoemission
Photons
Rashba‐splitting
Single crystals
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Summary:The Photoelectron‐Related Image and Nano‐Spectroscopy (PRINS) endstation located at the Taiwan Photon Source beamline 27A2 houses a photoelectron momentum microscope capable of performing direct‐space imaging, momentum‐space imaging and photoemission spectroscopy with position sensitivity. Here, the performance of this microscope is demonstrated using two in‐house photon sources – an Hg lamp and He(I) radiation – on a standard checkerboard‐patterned specimen and an Au(111) single crystal, respectively. By analyzing the intensity profile of the edge of the Au patterns, the Rashba‐splitting of the Au(111) Shockley surface state at 300 K, and the photoelectron intensity across the Fermi edge at 80 K, the spatial, momentum and energy resolution were estimated to be 50 nm, 0.0172 Å−1 and 26 meV, respectively. Additionally, it is shown that the band structures acquired in either constant energy contour mode or momentum‐resolved photoemission spectroscopy mode were in close agreement. A microscope hosted at Taiwan Photon Source beamline 27A2 that packs the functions of photoemission electron microscopy and angle‐resolved photoemission spectroscopy into one single instrument is presented.
ISSN:1600-5775
0909-0495
1600-5775
DOI:10.1107/S1600577523009761