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Cord Arnold

Coordinator of Rydberg seminars

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Resonant two-photon ionization of helium atoms studied by attosecond interferometry

Author

  • L. Neoričić
  • D. Busto
  • H. Laurell
  • R. Weissenbilder
  • M. Ammitzböll
  • S. Luo
  • J. Peschel
  • H. Wikmark
  • J. Lahl
  • S. Maclot
  • R. J. Squibb
  • S. Zhong
  • P. Eng-Johnsson
  • C. L. Arnold
  • R. Feifel
  • M. Gisselbrecht
  • E. Lindroth
  • A. L’Huillier
Show all

Summary, in English

We study resonant two-photon ionization of helium atoms via the 1s3p, 1s4p and 1s5p1P1 states using the 15th harmonic of a titanium-sapphire laser for the excitation and a weak fraction of the laser field for the ionization. The phase of the photoelectron wavepackets is measured by an attosecond interferometric technique, using the 17th harmonic. We perform experiments with angular resolution using a velocity map imaging spectrometer and with high energy resolution using a magnetic bottle electron spectrometer. Our results are compared to calculations using the two-photon random phase approximation with exchange to account for electron correlation effects. We give an interpretation for the multiple π-rad phase jumps observed, both at and away from resonance, as well as their dependence on the emission angle.

Department/s

  • Atomic Physics
  • Department of Physics
  • Lund Laser Centre, LLC
  • LTH Profile Area: Photon Science and Technology
  • NanoLund: Centre for Nanoscience
  • Synchrotron Radiation Research
  • LTH Profile Area: Nanoscience and Semiconductor Technology

Publishing year

2022-10

Language

English

Publication/Series

Frontiers in Physics

Volume

10

Document type

Journal article

Publisher

Frontiers Media S. A.

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • attosecond
  • attosecond dynamics
  • photoelectron interferometry
  • photoionization
  • photoionization dynamics

Status

Published

Project

  • Controlling the photoelectric effect in real-time

ISBN/ISSN/Other

  • ISSN: 2296-424X