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Figure 10
(a) Illustration of the timing scheme used in the experimental setup. The sample is excited every eighth ring repetition by an optical laser pump, while the detector is gated at double the frequency, so at every fourth ring repetition. In the double-gating mode, two consecutive gate signals alternately activate the two pixel counters (counters a and b) and simultaneously acquire images of the pumped and the background state. (b) Delay scan with the EIGER2 X 1M over the hybrid-mode filling pattern at the ELETTRA synchrotron. (c) High-resolution delay-scan of the detector gating signal around the single bunch, evidencing an effective gating duration of approximately 45 ns (FWHM). (d) Diffraction intensity of the zero-order GaAs/AlAs superlattice reflection in the proximity of the [002] AlAs peak as a function of pump–probe delay for the pumped (red) and unpumped (blue) images. (e) Relative transient diffraction intensity pumped/unpumped (black) compared with the relative pumped signal only (red), evidencing near-ideal background correction.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 30| Part 4| July 2023| Pages 723-738
https://doi.org/10.1107/S160057752300454X
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