A quantitative comparison of time-of-flight momentum microscopes and hemispherical analyzers for time- and angle-resolved photoemission spectroscopy experiments
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Abstract
<p class="first" id="d5275512e125">Time-of-flight-based momentum microscopy has a
growing presence in photoemission studies,
as it enables parallel energy- and momentum-resolved acquisition of the full photoelectron
distribution. Here, we report table-top extreme ultraviolet time- and angle-resolved
photoemission spectroscopy (trARPES) featuring both a hemispherical analyzer and a
momentum microscope within the same setup. We present a systematic comparison of the
two detection schemes and quantify experimentally relevant parameters, including pump-
and probe-induced space-charge effects, detection efficiency, photoelectron count
rates, and depth of focus. We highlight the advantages and limitations of both instruments
based on exemplary trARPES measurements of bulk WSe2. Our analysis demonstrates the
complementary nature of the two spectrometers for time-resolved ARPES experiments.
Their combination in a single experimental apparatus allows us to address a broad
range of scientific questions with trARPES.
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