Very-high-order harmonic generation from Ar atoms and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi mathvariant="normal">Ar</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>ions in superintense pulsed laser fields: An<i>ab initio</i>self-interaction-free time-dependent density-functional approach

We present an ab initio nonpertubative investigation of the mechanisms responsible for the production of very-high-order harmonic generation (HHG) from Ar atoms and ${\mathrm{Ar}}^{+}$ ions by means of the self-interaction-free time-dependent density-functional theory recently developed. Further, by introducing an effective charge concept, we can study at which laser intensity the contribution to the high-energy HHG from ${\mathrm{Ar}}^{+}$ ions precede over the Ar atoms. Comparing the HHG behavior from Ar atoms and ${\mathrm{Ar}}^{+}$ ions in the superintense laser field, we conclude that the high-energy HHG observed in the recent experiment originated from the ionized Ar atoms.

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