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Figure 10
(a) Ion mass-to-charge spectrum of N2O irradiated by 550 eV X-ray pulses recorded with the magnetic bottle spectrometer. (b) Photoelectrons produced by ionization of Ne atoms by 1.35 keV X-rays, recorded at different retardation voltages applied to the electrostatic lens. As the retardation voltage is increased, the manifold of three primary peaks which form the Ne KLL Auger–Meitner emission spectrum becomes more sharply defined and aligns with previously measured values, as shown by dotted gray lines (Krause et al., 1970BB22). (c) Resonant Auger–Meitner electron emission map of gas-phase 4-aminophenol, recorded with the MBES. Central photon energy of incoming X-ray pulse is plotted on the y-axis and electron kinetic energy is plotted on the x-axis. At photon energies corresponding to the manifold of O 1s → valence excitations in the molecule (535 eV) there is a resonant enhancement in the Auger–Meitner electron yield. The emission converges to normal KLL Auger–Meitner decay above the O K-edge at 540 eV. The highest kinetic energy photoelectrons are produced by X-ray ionization of the valence shell and show the expected linear dispersion with photon energy (marked by the dotted line).

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