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Experiments with electric charges have shown that if two objects each have an electric charge, they exert an electric force on each other. The magnitude of the force is linearly proportional to the net charge on each object and inversely proportional to the square of the distance between them. The direction of the force vector is along the imaginary line joining the two objects and is dictated by the signs of the charges involved.
Newton's third law applies to the Coulomb force — the...
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Comparison Between Electrical And Gravitational Forces01:24

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There are four fundamental forces in nature: the gravitational force, the electromagnetic force, the strong nuclear force, and the weak nuclear force. To compare the numerical strengths of the first two, take two particles of the same kind. Since electrons are fundamental particles, they are a good example.
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Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
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Electron Behavior00:54

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Overview
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
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Spatial Separation of Molecular Conformers and Clusters
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Atracción de electrones mediada por la repulsión de Coulomb

A Hamo1, A Benyamini1, I Shapir1

  • 1Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.

Nature
|July 23, 2016
PubMed
Resumen

Los científicos demostraron la atracción excitónica entre los electrones utilizando nanotubos de carbono. Este avance utiliza un sistema electrónico independiente para mediar la atracción, allanando el camino para una nueva superconductividad y estados exóticos de la materia.

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Área de la Ciencia:

  • Física de la materia condensada
  • Los materiales cuánticos
  • Nanotecnología

Sus antecedentes:

  • Los electrones típicamente se repelen entre sí debido a las fuerzas de Coulomb.
  • La superconductividad implica el emparejamiento de electrones, a menudo mediado por vibraciones de celosía.
  • La atracción excitónica, mediada por interacciones electrónicas, se propuso teóricamente para la superconductividad exótica, pero carecía de evidencia experimental.

Objetivo del estudio:

  • Para demostrar experimentalmente la atracción excitónica entre los electrones.
  • Para construir y estudiar el bloque de construcción fundamental del mecanismo excitónico.
  • Investigar la física de la atracción emergente y la energía de emparejamiento.

Principales métodos:

  • Fabricación de dispositivos cuánticos utilizando nanotubos de carbono prístino.
  • Manipulación de precisión criogénica de sistemas electrónicos.
  • Mediciones de transporte para detectar firmas de emparejamiento excitónico.

Principales resultados:

  • Demostró que dos electrones pueden atraerse entre sí mediados por un sistema electrónico independiente.
  • Demostró la capacidad del sistema para estudiar la física subyacente.
  • Se han observado señales de transporte indicativas de emparejamiento excitónico.

Conclusiones:

  • Proporcionó la primera evidencia experimental de la atracción excitónica entre los electrones.
  • Estableció una plataforma sintonizable para explorar los mecanismos excitónicos.
  • Abrió nuevas vías para diseñar estados exóticos de la materia y superconductores avanzados.