Abstract
We measure photoelectron momentum spectra from above-threshold ionization of Xe atoms in a linearly polarized two-color laser field with comparable intensities. The spectra show distinct forward-backward asymmetries along the laser polarization direction, which depend sensitively on the electron emission angle and the relative phase between the two-color components. We find that with increasing the emission angle relative to the laser polarization direction, there is a phase shift in the asymmetry curve as a function of the two-color relative phase. Using a semiclassical model, we disentangle the relative contributions of the nonscattering and the rescattering trajectories on the photoelectron angular distributions of the above-threshold ionization. We show that the angular-dependent asymmetry comes from different contributions of the nonscattering and rescattering trajectories at different emission angles. By tuning the relative phase of the parallel two-color laser fields, the relative contributions of the nonscattering and the rescattering trajectories can be precisely controlled.
Published Version
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