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The small time gap of synchrotron radiation in conventional multi-bunch mode(100-500MHz) is prohibitive for time-of-flight (ToF) based electronspectroscopy. Even the new generation of delay-line detectors with improvedtime resolution (<100ps) yields only 20-100 resolved time slices within a2-10ns gap. Here we present two techniques of implementing efficient ToFrecording at sources with high repetition rate. A fast electron-optical beamblanking unit with GHz bandwidth, integrated in a photoelectron momentummicroscope, allows chopping the photon-pulse train to any desired repetitionperiod. Aberration-free momentum distributions have been recorded at choppedpulse periods of 5MHz (at MAX II) and 1.25MHz (at BESSY II). The approach isbenchmarked against the alternative way of implementing a dispersive element,e.g. a hemispherical analyzer, in the electron optics. Both approaches,chopping in the time domain as well as bandpass pre-selection in the energydomain, can enable efficient ToF spectroscopy, spectroscopic real-space imagingand momentum microscopy with few-meV resolution using 100-500MHz Synchrotronradiation, highly-repetitive lasers or cavity-enhanced high-harmonic sources.For comparison, we show results recorded at BESSY II with a parasitic 4-bunchisland-orbit pulse train, coexisting with the 500MHz filling pattern on themain orbit.

Time-of-Flight Photoelectron Momentum Microscopy at 100-500 MHz Synchrotron Sources: Electron-Optical Chopping or Bandwidth Pre-Selection