Journal Article

PUBDB-2024-07819

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Asymmetric electrostatic dodecapole: compact bandpass filter with low aberrations for momentum microscopy

Tkach, O. (Corresponding author)Extern* ; Chernov, S.Extern*DESY* ; Babenkov, S.Extern* ; Lytvynenko, Y.Extern* ; Fedchenko, O.Extern* ; Medjanik, K.Extern* ; Vasilyev, D. ; Gloskowskii, A. ; Schlueter, C.DESY* ; Elmers, H.-J.Extern* ; Schoenhense, G. (Corresponding author)Extern*

2024
Wiley-Blackwell [Erscheinungsort nicht ermittelbar]

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Please use a persistent id in citations: doi:10.1107/S1600577524003540  doi:10.3204/PUBDB-2024-07819

Abstract: Imaging energy filters in photoelectron microscopes and momentum microscopes use spherical fields with deflection angles of 90°, 180° and even 2 × 180°. These instruments are optimized for high energy resolution, and exhibit image aberrations when operated in high transmission mode at medium energy resolution. Here, a new approach is presented for bandpass-filtered imaging in real or reciprocal space using an electrostatic dodecapole with an asymmetric electrode array. In addition to energy-dispersive beam deflection, this multipole allows aberration correction up to the third order. Here, its use is described as a bandpass prefilter in a time-of-flight momentum microscope at the hard X-ray beamline P22 of PETRA III. The entire instrument is housed in a straight vacuum tube because the deflection angle is only 4° and the beam displacement in the filter is only ∼8 mm. The multipole is framed by transfer lenses in the entrance and exit branches. Two sets of 16 different-sized entrance and exit apertures on piezomotor-driven mounts allow selection of the desired bandpass. For pass energies between 100 and 1400 eV and slit widths between 0.5 and 4 mm, the transmitted kinetic energy intervals are between 10 eV and a few hundred electronvolts (full width at half-maximum). The filter eliminates all higher or lower energy signals outside the selected bandpass, significantly improving the signal-to-background ratio in the time-of-flight analyzer.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-S (FS-PETRA-S)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. DFG project G:(GEPRIS)290329451 - Spin+Optische Kontrolle: Optisches Engineering von Zuständen mit geordnetem Spin auf der fs-Zeitskala (A02) (290329451) (290329451)
4. DFG project G:(GEPRIS)444821616 - Impuls-Mikroskopie von stark korrelierten Systemen unter mechanischer Dehnung (B04) (444821616) (444821616)

Experiment(s):

1. PETRA Beamline P22 (PETRA III)

Appears in the scientific report 2024

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