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  The CoESCA station at BESSY: Auger electron–photoelectron coincidences from surfaces demonstrated for Ag MNN

Leitner, T., Born, A., Bidermane, I., Ovsyannikov, R., Johansson, F., Sassa, Y., et al. (2021). The CoESCA station at BESSY: Auger electron–photoelectron coincidences from surfaces demonstrated for Ag MNN. Journal of Electron Spectroscopy and Related Phenomena, 250: 147075. doi:10.1016/j.elspec.2021.147075.

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https://doi.org/10.1016/j.elspec.2021.147075 (Publisher version)
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Leitner, T.1, Author
Born, A.1, Author
Bidermane, I.1, Author
Ovsyannikov, R.1, Author
Johansson, F.O.L.1, Author
Sassa, Y.1, Author
Föhlisch, A.1, Author
Lindblad, A.1, Author
Schumann, F. O.2, Author           
Svensson, S.1, Author
Mårtensson, N.1, Author
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1External Organizations, ou_persistent22              
2Department of Synthetic Materials and Functional Devices (SMFD), Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3316580              

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 Abstract: In this work, we present the CoESCA station for electron-electron coincidence spectroscopy from surfaces, built in a close collaboration between Uppsala University and Helmholtz-Zentrum Berlin at the BESSY II synchrotron facility in Berlin, Germany. We start with a detailed overview of previous work in the field of electron-electron coincidences, before we describe the CoESCA setup and its design parameters. The system is capable of recording shot-to-shot resolved 6D coincidence datasets, i.e. the kinetic energy and the two take off angles for both coincident electrons. The mathematics behind extracting and analysing these multi-dimensional coincidence datasets is introduced, with a focus on coincidence statistics, resulting in fundamental limits of the signal-to-noise ratio and its implications for acquisition times and the size of the raw data stream. The functionality of the CoESCA station is demonstrated for the example of Auger electron–photoelectron coincidences from silver surfaces for photoelectrons from the Ag 3d core levels and their corresponding MNN Auger electrons. The Auger spectra originating from the different core levels, 3d3/2 and 3d5/2 could be separated and further, the two-hole state energy distributions were determined for these Auger decay channels.

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 Dates: 2021-05-112021-07
 Publication Status: Published in print
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 Identifiers: DOI: 10.1016/j.elspec.2021.147075
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Title: Journal of Electron Spectroscopy and Related Phenomena
  Abbreviation : J. Electron Spectrosc. Relat. Phenom.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 250 Sequence Number: 147075 Start / End Page: - Identifier: ISSN: 0368-2048
CoNE: https://pure.mpg.de/cone/journals/resource/954925524767