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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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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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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 in...
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Related Experiment Video

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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

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Published on: December 3, 2013

Decoherence in weakly coupled excitonic complexes.

Tomáš Mančal1, Vytautas Balevičius, Leonas Valkunas

  • 1Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, CZ-121 16 Prague 2, Czech Republic. tomas.mancal@mff.cuni.cz

The Journal of Physical Chemistry. A
|February 23, 2011
PubMed
Summary
This summary is machine-generated.

This study derives new equations of motion for excitonic complexes, improving upon Förster theory by including decoherence and bath fluctuations. These advancements reveal how environmental interactions suppress resonance coupling in optical spectra.

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Last Updated: Jun 4, 2026

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Published on: October 13, 2017

Area of Science:

  • Quantum mechanics
  • Spectroscopy
  • Chemical physics

Background:

  • Excitonic complexes are crucial in light-harvesting systems.
  • Understanding energy transfer requires accounting for electronic delocalization.
  • Existing Förster theory lacks detailed decoherence descriptions.

Purpose of the Study:

  • Derive novel equations of motion for weakly coupled excitonic complexes.
  • Incorporate electronic delocalization and decoherence effects.
  • Improve theoretical descriptions of energy transfer dynamics.

Main Methods:

  • Formulation of quantum mechanical equations of motion.
  • Treatment in the basis of localized electronic states.
  • Calculation of linear absorption and 2D photon echo spectra.

Main Results:

  • Developed a description linking localized states to observable delocalization.
  • Equations relate to Förster theory but include bath-induced decoherence.
  • Demonstrated suppression of resonance coupling by bath fluctuations.

Conclusions:

  • The new model accurately captures delocalization effects in optical spectra.
  • Decoherence processes significantly impact resonance coupling.
  • Provides a more complete picture of energy transfer in complex systems.