This resulted in the underestimation of the double ionization rate by a huge factor.
2.
In the early 1990s in strong field atomic physics there were discoveries of high harmonic generation and correlated double ionization ( in which an atom can absorb hundreds of photons and emit two electrons ).
3.
Both helium atoms in the dimer can be ionized by a single photon with energy 63.86 eV . The proposed mechanism for this double ionization is that the photon ejects an electron from one atom, and then that electron hits the other helium atom and ionizes that as well.
4.
Photoelectron photoion coincidence spectroscopy can be used to shed light on reaction mechanisms, and can also be generalized to study double ionization in ( photoelectron ) photoion photoion coincidence ( ( PE ) PIPICO ), fluorescence using photoelectron photon coincidence ( PEFCO ), or photoelectron photoelectron coincidence ( PEPECO ).
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