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Atomic Absorption Spectroscopy: Interference01:25

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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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Controlling Below-Threshold Nonsequential Double Ionization via Quantum Interference.

A S Maxwell1, C Figueira de Morisson Faria1

  • 1Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.

Physical Review Letters
|April 23, 2016
PubMed
Summary
This summary is machine-generated.

Quantum interference controls electron behavior in nonsequential double ionization, manipulating the recollision excitation with subsequent ionization (RESI) mechanism. This control is achieved below direct ionization threshold intensity and is robust against experimental averaging.

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Area of Science:

  • Quantum physics
  • Atomic, molecular, and optical (AMO) physics
  • Strong-field physics

Background:

  • Nonsequential double ionization (NDSI) is a fundamental process in strong-field physics.
  • The recollision excitation with subsequent ionization (RESI) mechanism plays a crucial role in NDSI.
  • Controlling quantum interference effects in NDSI is an active area of research.

Purpose of the Study:

  • To demonstrate the control of the RESI mechanism in NDSI using quantum interference.
  • To investigate the influence of quantum interference on the shape, localization, and symmetry of electron momentum distributions.
  • To explore the tunability of electron correlation from correlated to anticorrelated distributions via interference.

Main Methods:

  • Numerical simulations of quantum dynamics in intense laser fields.
  • Employing specific coherent superpositions of excitation channels.
  • Analyzing electron momentum distributions resulting from NDSI.

Main Results:

  • Quantum interference can precisely control the RESI mechanism in NDSI.
  • The shape, localization, and symmetry of RESI electron-momentum distributions are controllable.
  • Correlated and anticorrelated electron momentum distributions can be shifted by manipulating interference, even below the direct ionization threshold.
  • Observed interference effects from electron indistinguishability, intracycle events, and different excitation channels.
  • These interference effects are robust against focal averaging and transverse-momentum integration.

Conclusions:

  • Quantum interference offers a powerful tool to control electron dynamics in NDSI.
  • The RESI mechanism can be precisely tuned via quantum interference, opening avenues for novel quantum control strategies.
  • Experimental verification of these simulated results is feasible due to the robustness of the observed effects.