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A quantitative comparison of time-of-flight momentum microscopes and hemispherical analyzers for time- and angle-resolved photoemission spectroscopy experiments

MPS-Authors
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Maklar,  Julian
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Dong,  Shuo
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Beaulieu,  Samuel
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Pincelli,  Tommaso
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Dendzik,  Maciej Ramon
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Applied Physics, KTH Royal Institute of Technology;

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Windsor,  Yaov William
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Xian,  R. Patrick
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Neurobiology, Northwestern University;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ernstorfer,  Ralph
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Rettig,  Laurenz
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Fulltext (public)

5.0024493.pdf
(Publisher version), 5MB

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Citation

Maklar, J., Dong, S., Beaulieu, S., Pincelli, T., Dendzik, M. R., Windsor, Y. W., et al. (2020). A quantitative comparison of time-of-flight momentum microscopes and hemispherical analyzers for time- and angle-resolved photoemission spectroscopy experiments. Review of Scientific Instruments, 91(12): 123112. doi:10.1063/5.0024493.


Cite as: http://hdl.handle.net/21.11116/0000-0007-D49F-7
Abstract
Time-of-flight-based momentum microscopy has a growing presence in photoemission studies, as it enables parallel energy- and momentum-resolved acquisition of the full photoelectron distribution. Here, we report table-top extreme ultraviolet time- and angle-resolved photoemission spectroscopy (trARPES) featuring both a hemispherical analyzer and a momentum microscope within the same setup. We present a systematic comparison of the two detection schemes and quantify experimentally relevant parameters, including pump- and probe-induced space-charge effects, detection efficiency, photoelectron count rates, and depth of focus. We highlight the advantages and limitations of both instruments based on exemplary trARPES measurements of bulk WSe2. Our analysis demonstrates the complementary nature of the two spectrometers for time-resolved ARPES experiments. Their combination in a single experimental apparatus allows us to address a broad range of scientific questions with trARPES.