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When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, the gas does work, and its temperature drops. Adiabatic compressions actually occur in the cylinders of a car, where the compressions of the gas-air mixture take place so quickly that there is no time for the mixture to exchange heat with its environment. Nevertheless, because work is done on the mixture during the compression, its...
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
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Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
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An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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Video Experimental Relacionado

Updated: Jan 13, 2026

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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Funcionales de Conexión Adiabática Consistentes con el Tamaño a Través de Interpolación de Matrices Basada en

Kyle Bystrom1, Timothy C Berkelbach1,2

  • 1Initiative for Computational Catalysis, Flatiron Institute, New York, New York 10010, United States.

Journal of chemical theory and computation
|January 8, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Desarrollamos un nuevo método llamado interpolación de matrices basada en orbitales (OSMI) de tamaño consistente para la teoría de funcionales de densidad (DFT). OSMI predice con precisión las propiedades moleculares y la energía de correlación electrónica, ofreciendo un marco prometedor para sistemas químicos complejos.

Palabras clave:
Teoría de funcionales de la densidadEnergía de correlaciónConsistencia de tamañoError de autointeracciónPropiedades molecularesQuímica cuántica computacional

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Área de la Ciencia:

  • Química Computacional
  • Química Cuántica
  • Ciencia de Materiales

Sus antecedentes:

  • La teoría de funcionales de la densidad (DFT) es una herramienta poderosa para los cálculos de estructura electrónica.
  • El desarrollo de funcionales de correlación precisos y consistentes en tamaño sigue siendo un desafío en DFT.
  • Los métodos existentes luchan con los errores de autointeracción y la precisión para diversos sistemas químicos.

Objetivo del estudio:

  • Introducir un formalismo novedoso, consistente en tamaño e invariante de orbitales para la construcción de funcionales de correlación.
  • Desarrollar un método que supere las limitaciones de los funcionales de conexión adiabática anteriores.
  • Mejorar la precisión y confiabilidad de los cálculos DFT para sistemas moleculares y el gas de electrones uniforme.

Principales métodos:

  • Construcción de matrices de energía de correlación en el espacio de orbitales ocupados para límites de correlación débil y fuerte.
  • Implementación de un enfoque de interpolación de matrices de tamaño consistente basado en orbitales (OSMI).
  • Diseño de una conexión adiabática no empírica y un funcional de límite de interacción fuerte de un parámetro.

Principales resultados:

  • OSMI reproduce con precisión la energía de correlación del gas de electrones uniforme en varias densidades.
  • OSMI demuestra una mayor precisión que MP2 y los funcionales de densidad no empíricos en la base de datos de termoquímica GMTKN55.
  • OSMI logra predicciones excelentes para las alturas de las barreras de reacción con errores promedio por debajo de 2 kcal mol⁻¹.
  • OSMI mejora el equilibrio entre los errores de espín y carga fraccionarios en las curvas de disociación de enlaces.

Conclusiones:

  • OSMI ofrece un marco robusto para cálculos precisos de estructura electrónica.
  • El método aborda con éxito la consistencia de tamaño y los errores de autointeracción.
  • OSMI muestra potencial para el estudio de sistemas químicos heterogéneos complejos.