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Sökning: WFRF:(Grum Grzhimailo Alexei N.) > (2021)

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1.
  • Maroju, Praveen Kumar, et al. (författare)
  • Complex attosecond waveform synthesis at fel fermi
  • 2021
  • Ingår i: Applied Sciences (Switzerland). - : MDPI AG. - 2076-3417. ; 11:21
  • Tidskriftsartikel (refereegranskat)abstract
    • Free-electron lasers (FELs) can produce radiation in the short wavelength range extending from the extreme ultraviolet (XUV) to the X-rays with a few to a few tens of femtoseconds pulse duration. These facilities have enabled significant breakthroughs in the field of atomic, molecular, and optical physics, implementing different schemes based on two-color photoionization mechanisms. In this article, we present the generation of attosecond pulse trains (APTs) at the seeded FEL FERMI using the beating of multiple phase-locked harmonics. We demonstrate the complex attosecond waveform shaping of the generated APTs, exploiting the ability to manipulate independently the amplitudes and the phases of the harmonics. The described generalized attosecond waveform synthesis technique with an arbitrary number of phase-locked harmonics will allow the generation of sub-100 as pulses with programmable electric fields.
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2.
  • Varvarezos, Lazaros, et al. (författare)
  • Near-threshold two-photon double ionization of Kr in the vacuum ultraviolet
  • 2021
  • Ingår i: Physical Review A. - 2469-9926. ; 103:2
  • Tidskriftsartikel (refereegranskat)abstract
    • We report angle-resolved measurements on photoelectrons emitted upon near-threshold two-photon double ionization (TPDI) of Kr irradiated by free-electron laser (FEL) pulses. These photoelectron angular distributions (PADs) are compared with the results of semirelativistic R-matrix calculations. As reported by Augustin et al. [Phys. Rev. A 98, 033408 (2018)10.1103/PhysRevA.98.033408], it is found that the presence of autoionizing resonances within the bandwidth of the exciting FEL pulse strongly influences the PADs. In contrast to measurements on lower-Z targets such as Ne and Ar, the larger spin-orbit interaction, inherent in 4p-subshell hole states of Kr, permits us to resolve and study PADs associated with some of the fine-structure components of the Kr+ and Kr2+ ions.
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