Off-resonance-enhanced polarization control in two-color atomic ionization

BOLL, D. I. R.; MARTINI, L.; FOJÓN, O. A.; PALACIOS, A.

Physical Review A

APS

Año: 2020 vol. 101

2469-9926

We investigate a polarization control scheme in two-color two-photon atomic ionization. Experiments employing free-electron laser or high-order harmonic generation sources have shown light polarization dependencies inabove threshold ionization of atoms assisted with an IR field. These were mostly performed at relatively highphotoelectron energies where the soft-photon approximation remains valid. We use here a perturbation theoryapproach to show the larger degree of control that can be attained when the short wavelength photon energyis below the ionization threshold. This largely unexplored energy region offers unique possibilities to achievepolarization control of the reaction.