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Sökning: WFRF:(Huismans Ymkje)

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1.
  • Hickstein, Daniel D., et al. (författare)
  • Direct Visualization of Laser-Driven Electron Multiple Scattering and Tunneling Distance in Strong-Field Ionization
  • 2012
  • Ingår i: Physical Review Letters. - 1079-7114. ; 109:7
  • Tidskriftsartikel (refereegranskat)abstract
    • Using a simple model of strong-field ionization of atoms that generalizes the well-known 3-step model from 1D to 3D, we show that the experimental photoelectron angular distributions resulting from laser ionization of xenon and argon display prominent structures that correspond to electrons that pass by their parent ion more than once before strongly scattering. The shape of these structures can be associated with the specific number of times the electron is driven past its parent ion in the laser field before scattering. Furthermore, a careful analysis of the cutoff energy of the structures allows us to experimentally measure the distance between the electron and ion at the moment of tunnel ionization. This work provides new physical insight into how atoms ionize in strong laser fields and has implications for further efforts to extract atomic and molecular dynamics from strong-field physics.
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2.
  • Rouzée, Arnaud, et al. (författare)
  • Molecular Movies from Molecular Frame Photoelectron Angular Distribution (MF-PAD) Measurements
  • 2014
  • Ingår i: Ultrafast Phenomena in Molecular Sciences : Femtosecond Physics and Chemistry - Femtosecond Physics and Chemistry. - Cham : Springer International Publishing. - 0172-6218. - 9783319020501 ; 107, s. 1-24
  • Bokkapitel (refereegranskat)abstract
    • We discuss recent and on-going experiments, where molecular frame photoelectron angular distributions (MFPADs) of high kinetic energy photoelectrons are measured in order to determine the time evolution of molecular structures in the course of a photochemical event. These experiments include, on the one hand, measurements where single XUV/X-ray photons, obtained from a free electron laser (FEL) or by means of high-harmonic generation (HHG), are used to eject a high energy photoelectron, and, on the other hand, measurements where a large number of mid-infrared photons are absorbed in the course of strong-field ionization. In the former case, first results indicate a manifestation of the both the electronic orbital and the molecular structure in the angle-resolved photoelectron distributions, while in the latter case novel holographic structures are measured that suggest that both the molecular structure and ultrafast electronic rearrangement processes can be studied with a time-resolution that reaches down into the attosecond and few-femtosecond domain.
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