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関連する概念動画

The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

56.4K
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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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

47.5K
sp3d and sp3d 2 Hybridization
47.5K
Equilibrium Conditions for a Particle01:23

Equilibrium Conditions for a Particle

2.1K
When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
2.1K
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

65.2K
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...
65.2K
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.6K
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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The Energies of Atomic Orbitals03:21

The Energies of Atomic Orbitals

29.8K
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.
29.8K

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Updated: Jan 8, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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量子電磁力学結合クラスターの大規模計算:複雑な系のための高性能実装

Nicholas P Bauman1, Himadri Pathak2, Marcus D Liebenthal1

  • 1Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, United States.

Journal of chemical theory and computation
|December 15, 2025
PubMed
まとめ
この要約は機械生成です。

GPU対応量子電磁力学結合クラスター法(QED-CC)を開発し、複雑な化学反応のシミュレーションを可能にしました。この新しい手法であるQED-CCSDは、より大きな系における共鳴空洞化学の正確な予測を可能にします。

キーワード:
量子電磁力学結合クラスターGPU加速共鳴空洞化学ExaChemTAMM高スループット計算

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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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科学分野:

  • 量子化学
  • 計算物理学
  • 化学反応ダイナミクス

背景:

  • 結合クラスター(CC)理論は量子系を正確にシミュレートします。
  • 量子電磁力学(QED)はCC理論を拡張して電子-光子相互作用をモデル化し、共鳴空洞化学を可能にします。
  • QED-CCを用いた大規模系のシミュレーションは計算コストが高く、スケーラブルなインフラストラクチャが不足しています。

研究 の 目的:

  • 単一および二重励起(QED-CCSD)を伴うGPU対応、高性能、オープンソースのQED-CC実装を発表すること。
  • TAMMインフラストラクチャを使用して、ExaChem量子化学ソフトウェアパッケージにQED-CCSDを統合すること。
  • より大きな系のシミュレーション能力を実証し、光子の自由度が基底状態特性に与える影響を分析すること。

主な方法:

  • GPU対応QED-CCSD実装を開発しました。
  • テンソル代数多体法(TAMM)を利用して、異種スーパーコンピューティングプラットフォーム上でスケーラブルなパフォーマンスを実現しました。
  • 実装を検証し、スケーラビリティを評価するために数値ベンチマークを実行しました。

主要な成果:

  • ExaChem内でGPUアクセラレーテッドQED-CCSD法を実装し、検証しました。
  • QED-CC法ではこれまで不可能だったより大きな量子系のシミュレーション能力を実証しました。
  • 光子の自由度がシミュレーション系の基底状態特性にどのように影響するかを示しました。

結論:

  • 開発されたQED-CCSD実装は、共鳴空洞化学のシミュレーションに対してスケーラブルで効率的なアプローチを提供します。
  • TAMMを搭載したExaChemは、高性能量子電磁力学結合クラスター計算のための堅牢なプラットフォームを提供します。
  • この進歩により、より大きく、より複雑な系における光と物質の相互作用の影響を受ける化学反応の正確な予測が容易になります。