Photoionization dynamics in the presence of attosecond pulse trains and strong fields

Niranjan Shivaram, Henry Timmers, Xiao Min Tong, Arvinder Sandhu

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We present experimental results and a theoretical framework for understanding the ionization dynamics in atoms exposed to XUV attosecond pulse trains and strong multi-cycle infrared (IR) fields. We invoke the Floquet formalism to model dressed atomic states as a manifold of Fourier components spaced by the laser frequency. In XUV-IR pump-probe measurements, we observe that the ionization yield oscillates due to quantum interference between photo-excitation paths to a Floquet state. We show that the intensity-dependent shifts of atomic structure modify the ionization channels and the associated interference phase. We extract this phase variation and compare it with simulations. These results provide a comprehensive description of the two-color ionization process and enable new schemes for control of attosecond ionization and fragmentation dynamics.

Original languageEnglish (US)
Pages (from-to)139-148
Number of pages10
JournalChemical Physics
StatePublished - Mar 12 2013


  • Attosecond
  • Floquet
  • Photoionization
  • Strong fields

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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