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Related Concept Videos

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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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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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.
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...
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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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.
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...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

956
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Quantitative regulation of electron-phonon coupling.

Shenghai Pei1, Zejuan Zhang1, Chenyin Jiao1

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China.

Reports on Progress in Physics. Physical Society (Great Britain)
|July 3, 2024
PubMed
Summary

Researchers precisely quantified electron-phonon coupling in CrBr3 using pressure and spectroscopy. This method allows for tuning material properties by controlling electron-phonon interactions, paving the way for new high-performance materials.

Keywords:
electron–phonon couplingpressure techniquequantitative regulationspectroscopytwo-dimensional systems

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spectroscopy

Background:

  • Electron-phonon (e-p) coupling is fundamental to material properties but lacks precise quantification.
  • Accurate measurement of e-p coupling is essential for designing advanced functional materials.
  • Current methods are insufficient for detailed analysis of e-p coupling strength.

Purpose of the Study:

  • To develop and demonstrate a method for quantitative regulation of e-p coupling.
  • To accurately determine e-p coupling strength in layered Chromium(II) bromide (CrBr3).
  • To explore the effect of pressure on e-p coupling in CrBr3.

Main Methods:

  • Utilized pressure engineering to tune material properties.
  • Employed *in-situ* spectroscopy to observe vibrational modes and Stokes shifts.
  • Quantified the Huang-Rhys factor (S) to determine e-p coupling strength.

Main Results:

  • Observed distinct vibrational modes and strong Stokes shifts in CrBr3, confirming e-p coupling.
  • Successfully quantified the Huang-Rhys factor (S) at the sample's temperature.
  • Demonstrated a 40% increase in S-value under pressure, showing efficient e-p coupling regulation.

Conclusions:

  • Developed a quantitative approach for measuring and modulating e-p coupling.
  • Pressure engineering is an effective strategy for controlling e-p coupling in CrBr3.
  • The findings provide a pathway for designing materials with tailored e-p coupling characteristics.