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相关概念视频

The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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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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Electronic Structure of Atoms02:28

Electronic Structure of Atoms

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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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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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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Quantum Numbers02:43

Quantum Numbers

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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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Updated: Jun 7, 2025

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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通过基于密度的基数组校正来实现化学精确的量子计算的捷径.

Diata Traore1,2, Olivier Adjoua1, César Feniou1,2

  • 1Sorbonne Université, LCT, UMR 7616 CNRS, 75005, Paris, France.

Communications chemistry
|November 18, 2024
PubMed
概括
此摘要是机器生成的。

我们开发了一种量子计算方法,以使用更少的量子比特实现精确的分子模拟. 这种方法加速了融合,提高了量子化学计算的化学精度.

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科学领域:

  • 量子计算是一种量子计算.
  • 计算化学计算化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 准确的量子化学计算对于分子建模至关重要,但需要大量的计算资源.
  • 目前的量子处理器具有有限的量子比特能力,这对复杂的化学模拟构成了挑战.
  • 尽量减少量子资源,同时保持定量准确性,对于推进量子计算应用至关重要.

研究的目的:

  • 开发一种使用有限的量子资源获得定量量子化学结果的方法.
  • 在量子计算中加速向完整基数集极限的趋同.
  • 为了实现药物设计和材料科学中的应用,准确的分子模拟.

主要方法:

  • 在密度函数理论中嵌入量子计算的替代品,使用GPU加速状态向量的仿真.
  • 应用基于密度的基准集纠正来适应基准集的特定系统和量子比特预算.
  • 采用在飞行基础上设置手工制作的方法,加上可变的设想.

主要成果:

  • 在降低量子比特需求的情况下获得了定量量子化学结果.
  • 证明了基础集的加速趋同,改善了电子密度和基本状态能量.
  • 展示了改进的第一阶特性,如双极时刻,以及作为经典能量校正的潜力.

结论:

  • 拟议的方法为化学准确的量子计算提供了捷径.
  • 这种方法提高了当前量子硬件上的量子化学模拟的效率.
  • 该技术在药物设计和材料科学中具有潜在的应用,因为它可以实现更准确的分子建模.