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Related Concept Videos

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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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.
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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...
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¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

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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...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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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...
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Spin–Spin Coupling Constant: Overview01:08

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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.
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Energy Bands in Solids01:01

Energy Bands in Solids

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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.
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Updated: Jan 8, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Spatial correlation at the boson peak frequency in amorphous materials.

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
Summary
This summary is machine-generated.

The Boson peak (BP) in metallic glasses is largely dispersionless but its intensity correlates with structure. This finding offers insights into amorphous material dynamics and glass transition theories.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Amorphous Materials Science

Background:

  • The Boson peak (BP) is a ubiquitous feature in amorphous materials, representing excess vibrational density of states.
  • Understanding the BP is crucial for elucidating glass dynamics and the glass transition phenomenon.
  • Previous research established the energy scale of the BP (1-10 meV or THz), but its momentum dependence and spatial correlations remain poorly understood.

Purpose of the Study:

  • To investigate the momentum dependence and spatial correlations of the Boson peak in metallic glasses.
  • To explore the relationship between the Boson peak intensity and the material's structure.
  • To develop a theoretical framework for describing the Boson peak excitation.

Main Methods:

  • Inelastic neutron scattering
  • Heat capacity measurements
  • Raman scattering
  • Molecular dynamics (MD) simulations
  • MD simulations with a generic Lennard-Jones potential

Main Results:

  • The Boson peak was observed in Zr-Cu-Al metallic glasses across a wide range of momentum transfer.
  • The energy of the Boson peak was found to be largely dispersionless.
  • The intensity of the Boson peak was observed to scale with the static structure factor.
  • MD simulations confirmed these findings and suggested a link between the BP and local structure fluctuations, such as shear strain.

Conclusions:

  • The Boson peak in metallic glasses exhibits minimal energy dispersion but intensity that correlates with structural properties.
  • An analytical expression for the dynamic structure factor of the BP excitation was formulated.
  • The study provides valuable insights into the fundamental nature of the Boson peak and guides the development of theories for amorphous materials.