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関連する概念動画

Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

1.1K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
1.1K
Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

381
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
381
Valence Bond Theory02:42

Valence Bond Theory

9.2K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
9.2K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.0K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.0K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
1.1K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.1K

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Updated: Sep 9, 2025

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
11:19

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

Published on: July 4, 2016

10.7K

スピン適応・フリップダウン・タイム依存密度関数理論

Chima S Chibueze1, Lucas Visscher1

  • 1Department of Chemistry and Pharmaceutical Sciences, Vrije Universiteit, De Boelelaan 1108, 1081 HZ Amsterdam, The Netherlands.

The Journal of chemical physics
|September 4, 2025
PubMed
まとめ
この要約は機械生成です。

この研究は,高スピン分子システムにおける低層の電子刺激を正確に計算するために,新しいスピン適応スピンフリップダウン時間依存密度関数理論 (SFD-TD-DFT) を導入します. 新しい制限されたオープンシェル・コーン・シャム (ROKS) 方法は,スピン・フリップ・トランジションの精度を向上させます.

さらに関連する動画

Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
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Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes

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In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
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In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging

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関連する実験動画

Last Updated: Sep 9, 2025

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
11:19

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

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Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
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Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes

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In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
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In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging

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科学分野:

  • コンピュータ化学
  • 量子力学
  • 理論的スペクトル

背景:

  • フェルミレベルでの軌道変性を持つシステムは,しばしば高スピン基底状態を示す.
  • 合計スピンが低い低い電子刺激は,スピン・フリップ・ダウン・トランジションでアクセスできます.
  • これらのスピン・フリップ刺激の正確な計算は,分子特性を理解するために不可欠です.

研究 の 目的:

  • スピンに適応したスピン・フリップダウン・タイム依存密度関数理論 (SFD-TD-DFT) の3つのアプローチを開発し,提示する.
  • 高スピン基底状態からの電子移行の興奮エネルギーを計算する.
  • これらの計算におけるスピン適応とカーネルの記述の役割を調査する.

主な方法:

  • Tamm-Dancoff近似 (TDA) 内の制限されたオープンシェルKohn-Sham (ROKS) 製法に基づく3つのSFD-TD-DFT方法の開発.
  • 作業方程式のカーネルに異なる2電子結合要素を使用した.
  • 単一刺激 (SF-CIS) と運動方程式 (SF-TDA) での構成相互作用から派生した完全にスピンに適応したROKS-SFD-TDA方法が導入されました.

主要な成果:

  • スピン・フリップの刺激を正確に計算するには,非コリネアなカーネルの記述が不可欠です.
  • 完全にスピンに適応した方法 (SF-CISとSF-TDA) は,相関効果の人工的な二重カウントにつながる可能性があります.
  • 準スピン適応型SF-TDA (Q-SF-TDA) 方法は,スピン制限のないSFD-TD-DFTに匹敵する安定性,効率性,性能を証明しています.

結論:

  • 開発されたROKS-SFD-TDAメソッドは,高スピンシステムにおけるスピン・フリップ・トランジションに正確な興奮エネルギーを提供します.
  • Q-SF-TDAメソッドは,これらの電子刺激を研究するための堅牢で効率的なアプローチを提供します.
  • これらの進歩は,変性系における電子構造とスペクトロスコピーのよりよい理論的理解に寄与する.