Design of the TOF electron spectrometer: (1) permanent magnet with a soft iron cone, (2) solenoid, (3) drift tube, (4) μ-metal shield, (5) skimmer of 500 μm size, (6) copper mesh, (7) double-stack of MCP, (8) fluorescence screen, and (9) nozzle to introduce the sample.
Image of the fluorescence screen recorded with an exposure time of 100 ms of the CCD camera at a count rate of approximately 20 000 events per second.
TOF spectra of Ar (black lines) shifted vertically according to the photon energy (right scale). The Auger LMM peaks are depicted by the vertical blue line. The red curves represent the calibration functions (1) for ionization of the Ar 2s (dashed line), 2p 3/2 (solid line), and 3s (dotted line) shells.
Energy peaks of the 2p 1/2 and 2p 3/2 electrons generated at a kinetic energy of ∼120 eV. Solid line represents the fit of Eq. (2) to the experimental spectrum. The individual peak contributions are shown by dashed lines.
Energy resolution obtained for the magnetic-bottle (closed circles) and the field-free (open circles) spectrometer configurations.
Collection efficiency of the 2p electrons obtained for the magnetic-bottle (red filled circles) and the field-free (black open circles) spectrometer configurations. The solid line represents calculated results for 1.1° acceptance angle by using Eq. (5) .
Dependency of the acceptance angle on the kinetic energies for the magnetic-bottle spectrometer configuration. The acceptance angle of 1.1° of the field-free spectrometer is depicted by a solid line.
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