Potential barrier effects in high-order harmonic generation by transition-metal ions

The experimental finding of significant enhancement or suppression of particular harmonics generated by the ionic component of laser-produced plasmas of transition-metal atoms is explained theoretically in terms of the standard three-step scenario for strong-field harmonic generation, taking into account the potential barrier effects that lead to a strong $3p\ensuremath{\rightarrow}3d$ electric dipole transition that dominates the photoionization cross sections of the outer subshells of those ions.

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