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08:22
Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
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.
Physical Review Letters
|May 13, 2011
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.
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.
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