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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
1.6K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

2.1K
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.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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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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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...
3.6K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

2.1K
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.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
2.1K

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Raman scattering mediated by neighboring molecules.

Mathew D Williams1, David S Bradshaw1, David L Andrews1

  • 1School of Chemistry, University of East Anglia, Norwich NR4 7TJ, United Kingdom.

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|May 9, 2016
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Summary

This study explores quantum electrodynamics in Raman scattering, revealing two new mechanisms of light-matter interaction due to coupled optical centers. These findings impact nanoscale spectroscopy and material identification.

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Area of Science:

  • Quantum Electrodynamics
  • Molecular Spectroscopy
  • Nanoscale Optics

Background:

  • Raman scattering typically involves vibrational state changes in single molecules.
  • Quantum mechanical theories describe scattering as photon annihilation and creation.
  • Understanding nanoscale interactions is crucial for advanced spectroscopy.

Purpose of the Study:

  • To investigate spectroscopic consequences of electrodynamic coupling between neighboring optical centers.
  • To identify and characterize mechanisms governing coupled molecular states.
  • To explore selection rules and experimental implications in fluid media.

Main Methods:

  • Quantum electrodynamical formulation of light-matter interaction.
  • Analysis of coupled optical centers within the near-field limit.
  • Examination of Stokes transitions with fixed neighboring states.

Main Results:

  • Identified two major mechanisms of electrodynamic coupling between optical centers.
  • Established distinct selection rules for each mechanism.
  • Observed high inverse power dependences on inter-center separation.

Conclusions:

  • Electrodynamic coupling significantly influences Raman scattering spectra at the nanoscale.
  • The identified mechanisms provide new insights into molecular interactions and material characterization.
  • Experimental validation in fluid media is proposed, considering pressure effects.