A two-electron generalization of the strong-field approximation predicts HHG cutoffs at 4.7-5.5 times the ponderomotive energy, reaching ~1.2 keV in helium.
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Two-Electron Effects Extend High-Harmonic Generation into the keV Regime
A two-electron generalization of the strong-field approximation predicts HHG cutoffs at 4.7-5.5 times the ponderomotive energy, reaching ~1.2 keV in helium.