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関連する概念動画

Phase Transitions02:31

Phase Transitions

19.1K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
19.1K
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

11.7K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
11.7K
Energy Diagrams, Transition States, and Intermediates02:13

Energy Diagrams, Transition States, and Intermediates

15.7K
Free-energy diagrams, or reaction coordinate diagrams, are graphs showing the energy changes that occur during a chemical reaction. The reaction coordinate represented on the horizontal axis shows how far the reaction has progressed structurally. Positions along the x-axis close to the reactants have structures resembling the reactants, while positions close to the products resemble the products.  Peaks on the energy diagram represent stable structures with measurable lifetimes, while...
15.7K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.4K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.4K
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

3.0K
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...
3.0K
Phase Transitions01:21

Phase Transitions

108
A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
108

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関連する実験動画

Updated: May 1, 2026

Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

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オーガニックの電荷移転複合体における量子相移行

Sachio Horiuchi1, Yoichi Okimoto, Reiji Kumai

  • 1Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8562, Japan. s-horiuchi@aist.go.jp

Science (New York, N.Y.)
|January 11, 2003
PubMed
まとめ

オーガニックの電荷移転複合体は,分子電荷の変動が格子ダイナミクスと結合した量子的臨界点を表している. この移行は圧力や化学変化によって制御され,量子パラ電気的振る舞いを明らかにすることができます.

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学
  • 物理化学 物理化学とは

背景:

  • オーガニックの電荷移転複合体は,中性イオンバレンスの不安定性によって引き起こされる相変遷を呈する.
  • これらの移行は,圧力や化学的変化などの外部刺激によって影響を受けることがあります.
  • 量子パラ電性は,絶対零点に近い介電的振る舞いを記述する.

研究 の 目的:

  • ゼロケルビンに調節された有機電荷伝送複合体における相変化の性質を調査する.
  • 量子臨界点と関連する電荷変動を分析する.
  • 電子伝送と格子ダイナミクスとの結合を理解するために.

主な方法:

  • 外部の圧力と化学的変化を用いて,相変化を調節する.
  • 量子パラ電力の特徴である介電的振る舞いを観察する.
  • 量子電荷の変動を示すために分子振動モードスペクトルを分析する.

主要な成果:

  • 段階移行は0ケルビンに向かってうまく調整され,量子的臨界点を定義しました.
  • 分子電荷の量子変動は,量子臨界点で観察されました.
  • 分子間のパイ電子移転は,零点格子ダイナミクスと結合していることが判明しました.

さらに関連する動画

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

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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

Last Updated: May 1, 2026

Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

Published on: October 18, 2018

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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

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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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結論:

  • この研究は,有機的電荷移転複合体におけるユニークな量子的臨界点を実証している.
  • この臨界点は,重要な量子電荷変動と結合された電子格子ダイナミクスによって特徴付けられます.
  • 圧力や化学変化などの外部パラメータは,これらの量子現象の制御を可能にします.