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Time-of-flight photoelectron momentum microscopy with 80–500 MHz photon sources: electron-optical pulse picker or bandpass pre-filter
- Source :
- Journal of synchrotron radiation 28(6), 1891-1908 (2021). doi:10.1107/S1600577521010511, Journal of Synchrotron Radiation
- Publication Year :
- 2021
- Publisher :
- Wiley-Blackwell, 2021.
-
Abstract
- Journal of synchrotron radiation 28(6), 1891 - 1908 (2021). doi:10.1107/S1600577521010511<br />The small time gaps of synchrotron radiation in conventional multi-bunch mode (100-500 MHz) or laser-based sources with high pulse rate (similar to 80 MHz) are prohibitive for time-of-flight (ToF) based photoelectron spectroscopy. Detectors with time resolution in the 100ps range yield only 20-100 resolved time slices within the small time gap. Here we present two techniques of implementing efficient ToF recording at sources with high repetition rate. A fast electron-optical beam blanking unit with GHz bandwidth, integrated in a photoelectron momentum microscope, allows electron-optical 'pulse-picking' with any desired repetition period. Aberration-free momentum distributions have been recorded at reduced pulse periods of 5 MHz (at MAXII) and 1.25 MHz (at BESSYII). The approach is compared with two alternative solutions: a bandpass pre-filter (here a hemispherical analyzer) or a parasitic four-bunch island-orbit pulse train, coexisting with the multi-bunch pattern on the main orbit. Chopping in the time domain or bandpass pre-selection in the energy domain can both enable efficient ToF spectroscopy and photoelectron momentum microscopy at 100-500 MHz synchrotrons, highly repetitive lasers or cavity-enhanced high-harmonic sources. The high photon flux of a UV-laser (80 MHz<br />Published by Wiley-Blackwell, [S.l.]
- Subjects :
- Nuclear and High Energy Physics
Spectrum analyzer
Materials science
Photon
Microscope
photoelectron diffraction
Synchrotron radiation
momentum microscopy
law.invention
Optics
law
ddc:550
Pulse wave
Time domain
time of flight spectroscopy
ARPES
pulse picking
Instrumentation
Momentum (technical analysis)
Radiation
business.industry
Research Papers
Time of flight
time-of-flight spectroscopy
Physics::Accelerator Physics
business
Subjects
Details
- Language :
- English
- ISSN :
- 16005775
- Database :
- OpenAIRE
- Journal :
- Journal of synchrotron radiation 28(6), 1891-1908 (2021). doi:10.1107/S1600577521010511, Journal of Synchrotron Radiation
- Accession number :
- edsair.doi.dedup.....aec1ecc1c808c6f03eb261138fd26404