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The Pauli Exclusion Principle03:06

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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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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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Electron Orbital Model01:18

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Orbitals are the areas outside of the atomic nucleus where electrons are most likely to reside. They are characterized by different energy levels, shapes, and three-dimensional orientations. The location of electrons is described most generally by a shell or principal energy level, then by a subshell within each shell, and finally, by individual orbitals found within the subshells.
The first shell is closest to the nucleus, and it has only one subshell with a single spherical orbital called the...
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Quantum Numbers02:43

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Reduced Mass Coordinates: Isolated Two-body Problem01:12

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In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
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Ampere-Maxwell's Law: Problem-Solving01:17

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A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Reducir el problema cuántico de muchos electrones a dos electrones con el aprendizaje automático

LeeAnn M Sager-Smith1, David A Mazziotti1

  • 1Department of Chemistry and The James Franck Institute, The University of Chicago, Chicago, Illinois60637, United States.

Journal of the American Chemical Society
|October 4, 2022
PubMed
Resumen
Este resumen es generado por máquina.

Un nuevo enfoque de aprendizaje automático simplifica los cálculos químicos complejos. Este método aprende ocupaciones geminales, reduciendo el problema de muchos electrones a un problema efectivo de dos electrones para predicciones precisas de la estructura electrónica.

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Área de la Ciencia:

  • Química computacional
  • La mecánica cuántica
  • Aprendizaje automático

Sus antecedentes:

  • El problema de muchos electrones plantea un desafío significativo en la química computacional, con los métodos existentes que se escalan mal con el tamaño del sistema.
  • El cálculo de las energías moleculares se basa en funciones de onda de dos electrones, pero determinar su distribución de ocupación (ocupaciones geminales) es complejo.
  • Un principio extendido de "aufbau" ofrece un enfoque físicamente elegante, pero requiere distribuciones de ocupación geminales precisas.

Objetivo del estudio:

  • Introducir un nuevo paradigma computacional para los cálculos de la estructura electrónica.
  • Desarrollar un modelo de aprendizaje automático capaz de aprender las distribuciones de ocupaciones geminales.
  • Para abordar el desafío del problema de muchos electrones en química computacional.

Principales métodos:

  • Se empleó una red neuronal convolucional para aprender distribuciones aproximadas de ocupación geminal.
  • La red neuronal fue entrenada en isómeros de hidrocarburos con 2-7 átomos de carbono.
  • El modelo fue validado prediciendo energías para isómeros de octano e hidrocarburos más grandes (8-15 carbonos).

Principales resultados:

  • La red neuronal convolucional aprendió con éxito las condiciones de representabilidad N, asegurando distribuciones válidas de electrones.
  • El modelo predijo con precisión las energías moleculares para los sistemas más allá de su conjunto de entrenamiento.
  • El enfoque demostró la viabilidad de reducir el problema de muchos electrones a un problema efectivo de dos electrones.

Conclusiones:

  • El aprendizaje automático ofrece una herramienta poderosa para superar las limitaciones de los métodos de química computacional tradicionales.
  • Este nuevo paradigma permite predicciones precisas de la estructura electrónica al resolver efectivamente el problema de muchos electrones.
  • El método desarrollado abre nuevas vías para cálculos de energía molecular eficientes y precisos.