Stimulating electron competition with extreme-ultraviolet-initiated high-harmonic-generation

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We address extreme-ultraviolet (XUV) initiated high-harmonic generation (XIHHG) in argon atoms observing a resonant enhancement of the high-energy harmonics when the XUV pulse energy is tuned to the well-known window resonance. We attribute this effect to a three-stage mechanism: excitation of the 3s3p6 4p window resonance, followed by field-assisted autoionisation and strong-field driven recollision. We also verify that the observed effect is robust against intensity-averaging, increasing the possibility that it may be observed experimentally. The resonant XIHHG mechanism represents an important addition to the attosecond toolset, as experimental schemes to identify signatures of correlation have heretofore proved elusive.
Original languageEnglish
Article number063105
Number of pages8
JournalPhysical Review A (Atomic, Molecular, and Optical Physics)
Issue number6
Publication statusPublished - 12 Dec 2023


  • High harmonic generation
  • attosecond


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