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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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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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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
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One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation01:24

One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation

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This lesson introduces two critical methods in pharmacokinetics, the Wagner-Nelson and Loo-Riegelman methods, used for estimating the absorption rate constant (ka) for drugs administered via non-intravenous routes. The Wagner-Nelson method relates ka to the plasma concentration derived from the slope of a semilog percent unabsorbed time plot. However, it is limited to drugs with one-compartment kinetics and can be impacted by factors like gastrointestinal motility or enzymatic degradation.
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関連する実験動画

Updated: Sep 10, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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多帯域緊密結合シミュレーションに合わせた測定スキームに基づいた変数量子エイゲンソルバー

Dongkeun Lee1, Hoon Ryu2

  • 1Center for Quantum Information R&D, Korea Institute of Science and Technology Information, Daejeon 34141, Republic of Korea.

Journal of chemical theory and computation
|August 26, 2025
PubMed
まとめ

緊密な結合理論を用いた原子的シミュレーションのための費用対効果の高い変数量子エイゲンソルバー (VQE) スキームを開発しました. この方法は,既存の技術と比較して,電子構造計算の計算効率を改善します.

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

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関連する実験動画

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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科学分野:

  • 量子コンピューティング
  • 計算物理
  • 材料科学

背景:

  • 精密な電子構造の計算は,材料科学にとって極めて重要です.
  • 変数量子Eigensolver (VQE) は,このようなタスクのための有望な量子アルゴリズムです.
  • 現在のVQE方法は,大規模なシステムの計算効率に問題があります.

研究 の 目的:

  • 原子学的シミュレーションでVQEの費用対効果の高い測定スキームを提案する.
  • 電子構造計算のためのVQEの計算効率を高める.
  • 量子装置での緊固結合 (TB) シミュレーションのための実践的なガイドラインを提供すること.

主な方法:

  • 下から上までの格子幾何学を用いて散らばった TB ハミルトニアンを作ります.
  • ハミルトニアンを標準ベース (SB) オペレーターの線形組み合わせとして表現する.
  • 複数の SB オペレーターの同時測定のための拡張ベル測定回路を使用し,回路数を減らす.

主要な成果:

  • 提案されたVQEスキームは,金属ハリドペロブスキート超電池のバンドギャップエネルギーを正確に決定します.
  • このスキームは,交代性に基づくパウリ群集法と比較して優れた計算効率を示している.
  • 3次元限定原子構造にVQEを成功裏に適用した.

結論:

  • 開発されたVQE測定スキームは,原子学的シミュレーションのためのコスト効率的なアプローチを提供します.
  • この方法は,TBシミュレーションの計算効率を大幅に改善します.
  • この研究は,NISQデバイス上の希少なヘルミシアン行列計算のための実用的な枠組みを提供します.