A theoretical model shows that resonant two-photon x-ray excitation combined with an optical laser can generate broadband x-ray second harmonic emission from gas-phase atoms, with a cutoff set by strong-field rescattering.
Ultrafast high-harmonic spectroscopy of solids
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Strong-Field-Assisted X-ray Second Harmonic Generation
A theoretical model shows that resonant two-photon x-ray excitation combined with an optical laser can generate broadband x-ray second harmonic emission from gas-phase atoms, with a cutoff set by strong-field rescattering.