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Related Concept Videos

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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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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Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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Time-resolved nonlinear microspectroscopy with Gaussian beams: Spatial coherence dynamics in quantum materials.

Minhaeng Cho1

  • 1Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Seoul 02841, Republic of Korea and Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.

The Journal of Chemical Physics
|November 13, 2025
PubMed
Summary

We developed a new spectroscopy method using structured light to track quantum coherence in materials. This technique measures exciton coherence diffusion, offering insights into energy transport in quantum materials.

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Area of Science:

  • Condensed-matter physics
  • Quantum optics
  • Spectroscopy

Background:

  • Traditional photon echo (PE) spectroscopy lacks spatial resolution for coherence dynamics.
  • Understanding spatial coherence transfer is crucial for quantum materials and energy transport.

Purpose of the Study:

  • To present a theoretical framework for time-resolved nonlinear microspectroscopy using structured light.
  • To probe spatial coherence transfer and quantum coherence migration in condensed-matter systems.

Main Methods:

  • Employing Laguerre-Gaussian (LG) modes to encode and track spatial coherence.
  • Expanding the diffusion propagator in LG modes to analyze mode mixing and angular momentum conservation.
  • Deriving analytical formulas for heterodyne-detected PE signals and 2D spectra.

Main Results:

  • Revealed radial mode mixing and orbital angular momentum conservation during coherence migration.
  • Identified distinct spectral signatures of spatial coherence transfer in decay and line shapes.
  • Developed a method to differentiate between coherent and incoherent transfer.

Conclusions:

  • The new technique enables measurement of exciton coherence diffusion constants in various materials.
  • Provides new insights into coherence dynamics for quantum materials and energy transport applications.
  • Offers a powerful tool for studying spatial coherence in condensed-matter systems.