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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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 have a...
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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 process,...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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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 in...

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Related Experiment Video

Updated: May 16, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

Polariton dynamics under strong light-molecule coupling.

Tal Schwartz1, James A Hutchison, Jérémie Léonard

  • 1ISIS & icFRC, Université de Strasbourg and CNRS (UMR 7006), 8 allée Gaspard Monge, 67000, Strasbourg, France.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|December 13, 2012
PubMed
Summary
This summary is machine-generated.

Investigating molecule-cavity systems under strong coupling reveals complex decay pathways. Surprisingly, the lower polariton exhibits an intrinsically long-lived nature, challenging previous assumptions in hybrid system research.

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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Area of Science:

  • Photophysics
  • Quantum Optics
  • Materials Science

Background:

  • Molecule-cavity systems exhibit unique quantum phenomena under strong coupling.
  • Understanding energy transfer and decay dynamics in hybrid light-matter systems is crucial.

Purpose of the Study:

  • To experimentally investigate the photophysical properties of molecule-cavity systems under strong coupling.
  • To elucidate the decay routes of polaritons and uncoupled molecules within these hybrid systems.

Main Methods:

  • Utilized steady-state and femtosecond time-resolved emission spectroscopy.
  • Employed time-resolved absorption techniques.
  • Achieved selective excitation of lower polaritons, upper polaritons, and uncoupled molecules.

Main Results:

  • Demonstrated complex and varied decay routes within the molecule-cavity system.
  • Observed that the lower polariton possesses an intrinsically long-lived characteristic.
  • Results challenge conventional expectations regarding decay dynamics in strongly coupled hybrid systems.

Conclusions:

  • The lower polariton in strongly coupled molecule-cavity systems is surprisingly long-lived.
  • Decay dynamics in these hybrid systems are more intricate than previously anticipated.
  • This finding has implications for designing and understanding quantum optical devices.