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Related Concept Videos

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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Atomic Emission Spectroscopy: Interference01:30

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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UV–Vis Spectroscopy of Conjugated Systems01:32

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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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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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Probing the Interstate Coupling near a Conical Intersection by Optical Spectroscopy.

Marwa H Farag1, Thomas L C Jansen1, Jasper Knoester1

  • 1Zernike Institute for Advanced Materials, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands.

The Journal of Physical Chemistry Letters
|August 11, 2016
PubMed
Summary
This summary is machine-generated.

Researchers propose a new experimental method to measure interstate coupling near conical intersections. This technique analyzes vibrational wavepacket dynamics to estimate coupling crucial for chemical reactions.

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Area of Science:

  • Chemical Physics
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Conical intersections are critical points where adiabatic potential energy surfaces intersect.
  • Interstate coupling between these surfaces drives chemical reactions but remains experimentally unquantified.
  • Existing methods cannot directly measure the coupling responsible for reactions at conical intersections.

Purpose of the Study:

  • To propose a novel experimental approach for estimating interstate coupling near conical intersections.
  • To provide a method for quantifying the coupling that drives chemical reactions between electronic states.
  • To develop a tool for analyzing the dynamics of photoisomerization processes.

Main Methods:

  • Utilizing a generic model for photoisomerization.
  • Analyzing vibrational wavepacket dynamics in adiabatic ground and excited electronic states.
  • Extracting nuclear wavepacket dynamics using linear absorption and 2D electronic spectroscopy.

Main Results:

  • The study proposes an experimental approach to estimate interstate coupling.
  • The method relies on analyzing vibrational wavepacket dynamics.
  • Comparing coupling mode frequencies in different electronic states offers a pathway to quantify interstate coupling.

Conclusions:

  • The proposed method offers a novel experimental tool to determine interstate coupling.
  • This technique can provide crucial insights into reaction dynamics at conical intersections.
  • Accurate measurement of interstate coupling is vital for understanding and controlling photochemical reactions.