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Electron pair emission detected by time-of-flight spectrometers: Recent progress
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View: Figures


Image of FIG. 1.
FIG. 1.

Sketch of the experimental setup. The two ToF spectrometers are aligned coplanar ±45° with respect to the sample normal. Here, for (γ,2e), the HHG light source is driven by a 1040 nm laser that is focused in a gas jet. The generated high-order harmonics passes through a monochromator for photon energy selection. Inset: Parallel momentum distribution of photoelectrons from the Shockley surface state as calibration of the ToF spectrometers.

Image of FIG. 2.
FIG. 2.

2D energy distribution obtained with  = 27 eV on Cu(111). The dashed white line marks the onset of pair emission. Three features emerge at 0.5, 2.4, and 4.8 eV below the onset. The inset shows the parallel momentum distribution for pairs between and . The corresponding state is marked with the dashed ellipse in the energy distribution.

Image of FIG. 3.
FIG. 3.

Sum energy vs. sum momentum in with . Directly below the emission onset, a feature with parabolic dispersion appears. The offset to zero in is due to a small sample misalignment.

Image of FIG. 4.
FIG. 4.

(a) 2D energy distribution obtained with on NiO(001). The diagonal dashed line marks the expected onset of pair emission. The intensity does not reproduce that but increases slowly towards lower pair energies. Also no preference for a specific energy sharing can be distinguished. (b) Intensity depending on along the white rectangle in (a).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electron pair emission detected by time-of-flight spectrometers: Recent progress