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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.9K
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.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

1.7K
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
1.7K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

3.5K
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...
3.5K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.6K
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...
1.6K
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

1.5K
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
1.5K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.6K
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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Related Experiment Video

Updated: Mar 18, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Strong coupling between mid-infrared localized plasmons and phonons.

Weiwei Wan, Xiaodong Yang, Jie Gao

    Optics Express
    |July 14, 2016
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate strong coupling between plasmonic metamaterials and polymethyl methacrylate (PMMA) molecules. This light-matter interaction, observed via anti-crossing, can be tuned by optical power, offering new ways to control light.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Condensed Matter Physics

    Background:

    • Localized surface plasmon resonances (LSPRs) in plasmonic metamaterials offer unique light-matter interaction capabilities.
    • Phonon vibrations in molecules like polymethyl methacrylate (PMMA) present distinct resonant frequencies.
    • Strong coupling between optical resonances and molecular vibrations is a key phenomenon in nanophotonics.

    Purpose of the Study:

    • To numerically and experimentally demonstrate strong coupling between plasmonic metamaterial resonances and PMMA molecular phonon resonances.
    • To investigate the tunability of this strong coupling.
    • To explore methods for manipulating light-matter interactions.

    Main Methods:

    • Numerical simulations of plasmonic metamaterial resonances.
    • Experimental tuning of plasmonic resonances across the 52 THz phonon resonance of PMMA.
    • Analysis of anti-crossing features and mode splitting in optical spectra.

    Main Results:

    • Achieved strong coupling between mid-infrared LSPRs and PMMA phonon resonances.
    • Observed anti-crossing behavior, forming two new plasmon-phonon modes.
    • Demonstrated that the energy gap from mode splitting is proportional to overlapped optical power.

    Conclusions:

    • Strong coupling between plasmonic metamaterials and PMMA molecules is achievable and experimentally verified.
    • The observed mode splitting and energy gap can be effectively manipulated by optical power.
    • This provides a pathway for controlling light-matter interactions in metamaterial-molecule systems.