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Related Concept Videos

Atomic Nuclei: Types of Nuclear Relaxation01:28

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Time delays in two-photon ionization.

Jing Su1, Hongcheng Ni1, Agnieszka Jaroń-Becker1

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Physical Review Letters
|January 24, 2015
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Summary
This summary is machine-generated.

We simulated time delays in helium atom two-photon ionization. Resonant transitions show significant absorption delays, unlike nonresonant ones, impacting photoelectron timing.

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Area of Science:

  • Quantum mechanics
  • Atomic physics
  • Ultrafast phenomena

Background:

  • Understanding electron behavior in atoms is crucial for fields like quantum computing and materials science.
  • Two-photon ionization is a fundamental process in atomic physics, offering insights into electron dynamics.

Purpose of the Study:

  • To investigate time delays in two-photon ionization of helium using ab initio numerical simulations.
  • To differentiate between absorption and photoemission time delays in atomic ionization.

Main Methods:

  • Ab initio numerical simulations were employed to model the process.
  • The attosecond streaking technique was utilized to measure temporal shifts.

Main Results:

  • Nonresonant two-photon absorption occurs without a time delay.
  • Resonant transitions exhibit a substantial absorption time delay, linearly dependent on the ionizing pulse duration.
  • The absorption delay is linked to the phase acquired during electron transition and the streaking field's effect on atomic resonance.

Conclusions:

  • The study highlights the critical role of resonant transitions in ultrafast atomic ionization dynamics.
  • Time-resolved measurements of ionization processes can be influenced by both photon absorption and photoelectron emission delays.