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We developed tabletop time-resolved X-ray absorption spectroscopy (TR-XAS) for femtosecond resolution. This technique allows studying light-induced reactions in isolated molecules, like CF4+ and SF6+.

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Area of Science:

  • Chemical Physics
  • Molecular Spectroscopy
  • Attosecond Science

Background:

  • Time-resolved X-ray absorption spectroscopy (TR-XAS) is typically confined to large facilities.
  • Previous TR-XAS studies were limited to subpicosecond resolution and condensed phases.

Purpose of the Study:

  • To achieve femtosecond temporal resolution in TR-XAS using a compact source.
  • To investigate light-induced chemical reactions in isolated gas-phase molecules.
  • To probe element-specific electronic transitions in CF4+ and SF6+.

Main Methods:

  • Development of a tabletop high-harmonic source generating up to 350 eV photons.
  • Application of TR-XAS to study isolated CF4+ and SF6+ molecules in the gas phase.
  • Element-specific probing of carbon K-edge and sulfur L-edges.

Main Results:

  • Realization of TR-XAS with low femtosecond temporal resolution.
  • Observation of previously unexamined light-induced chemical reactions in CF4+ and SF6+.
  • Characterization of reaction pathways and observation of symmetry breaking effects.

Conclusions:

  • Tabletop TR-XAS enables high-resolution studies of molecular dynamics in the gas phase.
  • The study reveals insights into symmetry breaking and Rydberg-valence mixing during molecular reactions.
  • This advancement opens new avenues for investigating ultrafast chemical processes.