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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Probing single-photon ionization on the attosecond time scale.

K Klünder1, J M Dahlström, M Gisselbrecht

  • 1Department of Physics, Lund University, P.O. Box 118, 22100 Lund, Sweden.

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|May 13, 2011
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Summary

Researchers measured time delays in photoionization of argon atoms using attosecond pulses. The study reveals how probing fields influence electron emission times from different atomic shells.

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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Ultrafast Science

Background:

  • Photoionization is a fundamental process in atomic physics.
  • Understanding electron emission dynamics is crucial for attosecond science.
  • Argon atoms are a common target for studying photoionization phenomena.

Purpose of the Study:

  • To measure photoemission time delays in argon atoms.
  • To investigate the influence of excitation energy on time delays.
  • To analyze the contribution of the probing infrared field to measured delays.

Main Methods:

  • Utilizing an interferometric measurement technique.
  • Exciting argon atoms with attosecond pulses.
  • Varying excitation energies from 32 to 42 eV.

Main Results:

  • Measured the time delay difference between electrons from 3s(2) and 3p(6) shells.
  • Found that the probing infrared field significantly contributes to the measured delay.
  • Quantified this contribution using a universal formula.

Conclusions:

  • The interferometric technique provides insights into electron emission dynamics.
  • The interaction with the probing field is a critical factor in time-delay measurements.
  • Accurate determination of photoemission delays requires accounting for measurement artifacts.