[Numerical simulation on HHG spectra of two-electron H3(+) model].

The authors present a one-dimensional calculation model of H3(+), and the time-dependent wavefunction was obtained by the symmetric split-operator method. The authors investigated the high-order harmonic generation (HHG) properties of H3(+) model exposed to 800 nm-wavelength ultrashort laser pulse. The effect of electron interaction on the HHG spectra is less profound than at the cut-off frequency. We also calculated the HHG spectra for different internuclear separation values close to realistic one. Most of the calculated cutoff frequencies are beyond the three-step model's prediction, and a preliminary scenario is suggested.