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Probing Photoionization Dynamics in Acetylene with Angle-Resolved Attosecond Interferometry.

Alexie Boyer1, Vincent Loriot1, Saikat Nandi1

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Photoionization of acetylene using extreme ultraviolet light reveals electron emission occurs 28 attoseconds faster than in argon. This finding, using attosecond interferometry, probes molecular potential dynamics.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Dynamics
  • Ultrafast Spectroscopy

Background:

  • Acetylene's electronic structure allows isolated photoionization from its outermost valence orbital.
  • Attosecond pulse techniques enable probing ultrafast molecular dynamics.
  • Spectral congestion can complicate photoionization studies in polyatomic molecules.

Purpose of the Study:

  • To measure photoionization time delays in acetylene relative to a reference atom (argon).
  • To investigate the influence of molecular potential on photoemission timing.
  • To demonstrate the utility of angle-resolved attosecond interferometry for studying molecular systems.

Main Methods:

  • Utilizing an angle-resolved attosecond interferometric technique.
  • Employing extreme ultraviolet light to ionize acetylene molecules.
  • Comparing photoemission time delays of acetylene with those of argon.

Main Results:

  • Photoemission from acetylene's outermost valence orbital is advanced by approximately 28 attoseconds compared to argon.
  • Significant angular dependence of relative photoionization time delays was observed.
  • An analytical model explained the angular variation due to anisotropic molecular potentials.

Conclusions:

  • Attosecond time-resolved measurements are crucial for understanding the nonspherical nature of molecular potentials.
  • Acetylene serves as a model system for studying photoionization dynamics without spectral congestion.
  • The interplay of short-range potentials significantly influences photoemission timing in molecules.