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- W2914885870 abstract "We theoretically investigate the two-color above-threshold ionization of atoms and ions by twisted XUV Bessel and Laguerre-Gaussian (LG) beams in the presence of a strong circularly polarized near-infrared (NIR) laser field. The presence of the NIR field modifies the continuum states accessible to the photoelectron. Based on the strong-field approximation, we explore the resulting energy and angular distributions of photoelectron as a function of the beam parameters. In particular, we analyze dichroism signals that arise due to the twisted nature of the XUV beam and the helicity of the NIR field. We focus on the comparison between LG beams and Bessel beams in the paraxial approximation. Here, we find that both beams yield similar results when the paraxial regime is valid. For localized targets, the dichroism signals strongly depend on the size and position of the atoms relative to the beam axis. Moreover, the dichroism signal tends to zero when the XUV LG beam is linear polarized. Detailed computations of the dichroism are performed and discussed for the $4s$ valence-shell photoionization of ${mathrm{Ca}}^{+}$ ions." @default.
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- W2914885870 date "2019-02-04" @default.
- W2914885870 modified "2023-09-23" @default.
- W2914885870 title "Dichroism in two-color above-threshold ionization with twisted XUV beams and intense infrared laser fields" @default.
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- W2914885870 doi "https://doi.org/10.1103/physreva.99.023403" @default.
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