Two electrons can escape an atom simultaneously through a collective tunneling channel, with the electron-electron repulsion shaping the escape path and leaving a measurable lateral momentum signature.
Therefore, we consider the short pulses, where sig- nificant deviations from SI can be expected
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Collective tunnel ionization in atomic systems
Two electrons can escape an atom simultaneously through a collective tunneling channel, with the electron-electron repulsion shaping the escape path and leaving a measurable lateral momentum signature.