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231225s2021 xx |||||o 00| ||eng c |
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|a 10.1107/S1600577521010511
|2 doi
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|a pubmed24n1558.xml
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|a (DE-627)NLM332770311
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|a (NLM)34738944
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Schönhense, G
|e verfasserin
|4 aut
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|a Time-of-flight photoelectron momentum microscopy with 80-500 MHz photon sources
|b electron-optical pulse picker or bandpass pre-filter
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|c 2021
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 05.10.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a open access.
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|a The small time gaps of synchrotron radiation in conventional multi-bunch mode (100-500 MHz) or laser-based sources with high pulse rate (∼80 MHz) are prohibitive for time-of-flight (ToF) based photoelectron spectroscopy. Detectors with time resolution in the 100 ps 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 MAX II) and 1.25 MHz (at BESSY II). 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, <1 meV bandwidth) facilitates momentum microscopy with an energy resolution of 4.2 meV and an analyzed region-of-interest (ROI) down to <800 nm. In this novel approach to `sub-µm-ARPES' the ROI is defined by a small field aperture in an intermediate Gaussian image, regardless of the size of the photon spot
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|a Journal Article
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|a ARPES
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|a momentum microscopy
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|a photoelectron diffraction
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|a pulse picking
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|a time-of-flight spectroscopy
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|a Medjanik, K
|e verfasserin
|4 aut
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|a Fedchenko, O
|e verfasserin
|4 aut
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|a Zymaková, A
|e verfasserin
|4 aut
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|a Chernov, S
|e verfasserin
|4 aut
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|a Kutnyakhov, D
|e verfasserin
|4 aut
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|a Vasilyev, D
|e verfasserin
|4 aut
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|a Babenkov, S
|e verfasserin
|4 aut
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|a Elmers, H J
|e verfasserin
|4 aut
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|a Baumgärtel, P
|e verfasserin
|4 aut
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|a Goslawski, P
|e verfasserin
|4 aut
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|a Öhrwall, G
|e verfasserin
|4 aut
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|a Grunske, T
|e verfasserin
|4 aut
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|a Kauerhof, T
|e verfasserin
|4 aut
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|a von Volkmann, K
|e verfasserin
|4 aut
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|a Kallmayer, M
|e verfasserin
|4 aut
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|a Ellguth, M
|e verfasserin
|4 aut
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|a Oelsner, A
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of synchrotron radiation
|d 1994
|g 28(2021), Pt 6 vom: 01. Nov., Seite 1891-1908
|w (DE-627)NLM09824129X
|x 1600-5775
|7 nnns
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| 773 |
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|g volume:28
|g year:2021
|g number:Pt 6
|g day:01
|g month:11
|g pages:1891-1908
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|u http://dx.doi.org/10.1107/S1600577521010511
|3 Volltext
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|d 28
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|e Pt 6
|b 01
|c 11
|h 1891-1908
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