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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.4K
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...
1.4K
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

1.9K
Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
1.9K
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

6.5K
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
6.5K
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

1.4K
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
1.4K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.4K
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...
1.4K
Energy Bands in Solids01:01

Energy Bands in Solids

1.8K
Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
1.8K

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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非晶質材料におけるボソンピーク周波数の空間相関

X Y Li1,2, H P Zhang3,4, S Lan5,6

  • 1Department of Physics, City University of Hong Kong; 83 Tat Chee Avenue, Hong Kong, China.

Nature communications
|December 17, 2025
PubMed
まとめ

金属ガラスのボソンピーク（BP）はほとんど分散しないが、その強度は構造と相関する。この発見は、非晶質材料のダイナミクスとガラス転移理論に洞察を与える。

キーワード:
非晶質材料金属ガラスボソンピーク中性子散乱分子動力学シミュレーション構造相関ガラス転移

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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科学分野:

  • 物性物理学
  • 材料科学
  • 非晶質材料科学

背景:

  • ボソンピーク（BP）は、非晶質材料における振動状態密度の過剰を表す普遍的な特徴である。
  • BPの理解は、ガラスのダイナミクスとガラス転移現象を解明するために不可欠である。
  • 以前の研究ではBPのエネルギー規模（1-10 meVまたはTHz）が確立されたが、その運動量依存性と空間相関は依然として十分に理解されていない。

研究 の 目的:

  • 金属ガラスにおけるボソンピークの運動量依存性と空間相関を調査すること。
  • ボソンピーク強度と材料の構造との関係を探求すること。
  • ボソンピーク励起を記述するための理論的枠組みを開発すること。

主な方法:

  • 非弾性中性子散乱
  • 熱容量測定
  • ラマンスペクトル
  • 分子動力学（MD）シミュレーション
  • 一般的なレナード・ジョーンズポテンシャルを用いたMDシミュレーション

主要な成果:

  • Zr-Cu-Al金属ガラスにおいて、広い運動量伝達範囲にわたってボソンピークが観測された。
  • ボソンピークのエネルギーは、ほとんど分散しないことがわかった。
  • ボソンピークの強度は、静的構造因子に比例してスケールすることが観測された。
  • MDシミュレーションはこれらの発見を確認し、BPと局所構造変動（せん断ひずみなど）との関連を示唆した。

結論:

  • 金属ガラスのボソンピークは、エネルギー分散が最小限であるにもかかわらず、構造特性と相関する強度を示す。
  • BP励起の動的構造因子に対する解析的表現が定式化された。
  • この研究は、ボソンピークの根本的な性質に関する貴重な洞察を提供し、非晶質材料の理論開発を導く。