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  Disentangling surface atomic motions from surface field effects in ultrafast low-energy electron diffraction

Lee, C., Marx, A., Kassier, G., & Miller, R. J. D. (2022). Disentangling surface atomic motions from surface field effects in ultrafast low-energy electron diffraction. Communications Materials, 3: 10. doi:10.1038/s43246-022-00231-9.

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https://doi.org/10.1038/s43246-022-00231-9 (Publisher version)
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 Creators:
Lee, C.1, 2, 3, Author              
Marx, A.2, 3, Author              
Kassier, G.2, 3, Author              
Miller, R. J. D.1, Author
Affiliations:
1Departments of Chemistry and Physics, University of Toronto, ou_persistent22              
2Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
3Center for Free-Electron Laser Science, ou_persistent22              

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 Abstract: Ultrafast low-energy electron diffraction holds potential to provide atomic level details to the surface dynamics controlling processes from surface chemistry to exotic collective effects. Accessing the primary timescales requires subpicosecond excitation pulses to prepare the corresponding nonequilibrium state. The needed excitation for maximum contrast above background invariably leads to photoinduced electron emission with the creation of surface fields that affect diffraction and must be quantified to recover the key structural dynamics. Using 2 keV ultrashort low-energy electron bunches, we investigate this field effect on the ensuing electron distribution in projection imaging and diffraction as a function of excitation intensity. Using a structural model, we demonstrate a quantitative separation of the surface field effect on electron diffraction, enabling isolation of the structural dynamics of interest. Particle trajectory simulations provide insight into the correlation between geometrical characteristics of the charge separated region and the corresponding intensity modulation at the detector.

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Language(s): eng - English
 Dates: 2021-07-292022-01-192022-02-16
 Publication Status: Published online
 Pages: -
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 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s43246-022-00231-9
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Title: Communications Materials
  Abbreviation : Commun Mater
Source Genre: Journal
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Publ. Info: London : Springer Nature
Pages: - Volume / Issue: 3 Sequence Number: 10 Start / End Page: - Identifier: ISSN: 2662-4443
CoNE: https://pure.mpg.de/cone/journals/resource/2662-4443