Fig. 3: Counts from the Du and Dd detectors plotted as the energy Ef of the detected X-ray photons versus the incident X-ray photon energy (expressed as the difference of the incident energy Ei and the resonance energy E0).
From: Resonant X-ray excitation of the nuclear clock isomer 45Sc
The photons were recorded in a time window of about 20−80 ms after every pulse-train excitation. Each photon is shown by a blue circle for Du and a yellow circle for Dd. a, All detector counts with Ef ≲ 26 keV for incident energies in a range of −40 eV ≲ Ei − E0 ≲ 40 eV around the 45Sc resonance energy E0. Vertical red lines indicate a 10-eV ROI around Ei = E0. Horizontal dark yellow lines indicate a 1-keV ROI around Ef = 12.4 keV, whereas the horizontal magenta lines indicate a 1-keV ROI around Ef = 4.3 keV, the approximate energy of the fluorescence photons. b, Close-up of the 4.3-keV ROI, showing two clusters of counts centred at the energies of Sc Kα and Kβ fluorescence. c, Close-up of the 12.4-keV ROI.
