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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Measuring how one directional quantity affects another along a specific path involves comparing their orientation and strength. When two such quantities are represented using direction and amount, a numerical result is computed to show how much one acts along the path of the other. This result comes from a rule combining both inputs' horizontal and vertical parts and adding the results.This calculation gives a single value that grows larger when both inputs point in similar directions and...
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Dynamics of Correlated Double-Ionization of Two-Electron Quantum Dots in Laser Fields.

Materials (Basel, Switzerland)·2023
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Direct and Sequential Two-Photon Double Ionization of Two-Electron Quantum Dots.

Henri Bachau1, Lampros A A Nikolopoulos2

  • 1Centre des Lasers Intenses et Applications, Université de Bordeaux-CNRS-CEA , F-33405 Talence Cedex, France.

The Journal of Physical Chemistry. A
|January 23, 2018
PubMed
Summary

Quantum dot size dramatically impacts electron behavior under laser fields. Reducing quantum dot size significantly boosts double ionization yields and alters electron kinetic energy spectra.

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Area of Science:

  • Quantum physics
  • Materials science

Background:

  • Two-electron quantum dots (QDs) are crucial in nanoscience.
  • Understanding their behavior under intense laser fields is key for applications.

Purpose of the Study:

  • Investigate double ionization yields and kinetic energy spectra of two-electron QDs in laser fields.
  • Analyze the influence of QD size on these properties.

Main Methods:

  • Utilized ab initio nonperturbative configuration interaction theory.
  • Simulated QD dynamics in THz and mid-IR ultrashort laser fields.
  • Approximated QD confinement potential with Gaussian-like spatial dependence.

Main Results:

  • Double ionization yields increase by orders of magnitude as QD size decreases.
  • QD size dictates the dominance of sequential or direct two-photon double ionization.
  • Sequential ionization leads to a doubly peaked kinetic energy spectrum, unlike atomic counterparts.

Conclusions:

  • Quantum dot size is a critical parameter controlling ionization dynamics.
  • The study reveals distinct spectral features compared to atomic systems.
  • Findings offer insights into electron correlation and ionization in nanostructures.