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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.
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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Interference and Superposition of Waves01:07

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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
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Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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NMR Spectroscopy: Spin–Spin Coupling01:08

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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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Interference: Path Lengths01:10

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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Atomic Absorption Spectroscopy: Interference01:25

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Updated: Apr 24, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Phonon interference in single-molecule junctions.

Sai C Yelishala1, Yunxuan Zhu1, P M Martinez2,3

  • 1Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO, USA.

Nature Materials
|March 29, 2025
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Summary
This summary is machine-generated.

Scientists observed phonon interference at room temperature in molecular junctions. This finding, enabled by advanced scanning thermal probes, reveals how molecular structure impacts heat flow, paving the way for new thermal transport studies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Wave interference is crucial for controlling electronic and photonic properties.
  • Phonon (thermal vibration) interference is poorly understood due to experimental difficulties, especially in insulating materials.
  • Coherent thermal transport is fundamental to understanding heat flow in solids.

Purpose of the Study:

  • To experimentally observe and characterize phonon interference at room temperature.
  • To investigate the role of molecular structure in phonon interference and thermal transport.
  • To enable single-molecule level studies of wave-driven material properties.

Main Methods:

  • Development of custom scanning thermal probes with high stability and sensitivity.
  • Quantification of heat flow through individual molecular junctions.
  • Utilizing isomers of oligo(phenylene ethynylene)3 with varying central ring connections (para- vs. meta-).
  • Performing quantum-mechanically accurate molecular dynamics simulations.

Main Results:

  • Successful observation of phonon interference at room temperature in molecular junctions.
  • Demonstrated a significant reduction in thermal conductance for meta-connected molecular structures compared to para-connected ones.
  • Attributed the reduced thermal conductance to destructive interference of phonons within the molecular backbone.

Conclusions:

  • Phonon interference can be observed and controlled at the molecular level.
  • Molecular geometry significantly influences coherent thermal transport.
  • This research opens new avenues for exploring wave phenomena in phonons and designing materials with tailored thermal properties.