Abstract
We observe a two-electron interference effect in the symmetrized amplitude of the resonant double photoionization of Mg which was predicted theoretically, but never before observed experimentally. This observation is based on our experimental study of angle-resolved double photoionization of Mg at the photon energy of 55.49 eV (2p → 3d resonance) under equal and unequal energy sharing conditions.
Highlights
There are processes characterized by differential cross sections, either in energy or in angle, which carry the signature of the target orbitals and are used to extract information on the electronic structure in the gas phase as well as in condensed matter
The measurements have been performed at 55.49 eV, which corresponds to the excitation of the Mg(2p63s2) → Mg(2p53s23d) resonance, because the measurement of the triple differential cross section (TDCS) of metal vapours even at the third generation synchrotron radiation sources is very challenging
On one hand, the resonance enhances the photoabsorption cross section, on the other hand, it may affect the shape of the TDCS
Summary
There are processes characterized by differential cross sections, either in energy or in angle, which carry the signature of the target orbitals and are used to extract information on the electronic structure in the gas phase as well as in condensed matter. At all θ1 the TDCS shape displays a node at the relative angle of emission of the two electrons, θ12, of 180° as expected for the singlet odd character of the double continuum wave function.
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