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Sökning: WFRF:(Burkov S. M.)

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1.
  • Gryzlova, E. V., et al. (författare)
  • Influence of an atomic resonance on the coherent control of the photoionization process
  • 2022
  • Ingår i: Physical Review Research. - 2643-1564. ; 4:3
  • Tidskriftsartikel (refereegranskat)abstract
    • In coherent control schemes, pathways connecting an initial and a final state can be independently controlled by manipulating the complex amplitudes of their transition matrix elements. For paths characterized by the absorption of multiple photons, these quantities depend on the magnitude and phase between the intermediate steps, and are expected to be strongly affected by the presence of resonances. We investigate the coherent control of the photoemission process in neon using a phase-controlled two-color extreme ultraviolet pulse with frequency in proximity of an excited energy state. Using helium as a reference, we show that the presence of such a resonance in neon modifies the amplitude and phase of the asymmetric emission of photoelectrons. Theoretical simulations based on perturbation theory are in fair agreement with the experimental observations.
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2.
  • Augustin, S., et al. (författare)
  • Signatures of autoionization in the angular electron distribution in two-photon double ionization of Ar
  • 2018
  • Ingår i: Physical Review A. - 2469-9926. ; 98:3
  • Tidskriftsartikel (refereegranskat)abstract
    • A kinematically complete experiment on two-photon double ionization of Ar by free-electron laser radiation with a photon energy of 27.93 eV was performed. The electron energy spectra show that double ionization is dominated by the sequential process. Comparison of the electron angular distributions to our data for single ionization and to theory confirms that even in the sequential process the electrons from both ionization steps are correlated with each other through polarization of the intermediate Ar+ state. Furthermore, a very important role of autoionization in both ionization steps is found.
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