Time-of-flight photoelectron momentum microscopy with 80–500 MHz photon sources: electron-optical pulse picker or bandpass pre-filter

Schönhense, G.; Medjanik, K.; Fedchenko, O.; Zymaková, A.; Chernov, S.; Kutnyakhov, D.; Vasilyev, D.; Babenkov, S.; Elmers, H.J.; Baumgärtel, P.; Goslawski, P.; Öhrwall, G.; Grunske, T.; Kauerhof, T.; von Volkmann, K.; Kallmayer, M.; Ellguth, M.; Oelsner, A.

doi:10.1107/S1600577521010511

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Figure 6
Small-area momentum microscopy using small field apertures. Results taken for an Au checkerboard structure (`Chessy', Plano GmbH) with fully open field aperture (a) and apertures of 20 µm (e) and 10 µm (f). (c) Resolution limit in PEEM mode. (b, d, g) Line scans along the dashed lines in (a, c, e and f). Dashed square profiles in (g) denote the widths expected for an ideal, aberration-free lens. (a, b, e–g) Measured at the Fermi edge of the Au structure at E_kin = 2.5 eV, corresponding to $[k_{\parallel}^{\,\rm{max}}]$ = 0.8 Å⁻¹. (h) ROI diameter as a function of $[k_{\parallel}^{\,\rm{max}}]$ as measured for field apertures of 20 µm (red dot) and 10 µm (blue dots) and as calculated for the full lens optics at field F = 5 kV mm⁻¹ in the small-aperture limit (dashed blue curve) and for a 10 µm aperture (full blue curve). For comparison, the small-aperture limits for F = 7.5 kV mm⁻¹ and for the pure extractor field of 5 kV mm⁻¹ are also shown [all curves from Tusche et al. (2015

)].

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 28| Part 6| November 2021| Pages 1891-1908

https://doi.org/10.1107/S1600577521010511

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