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Related Concept Videos

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

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When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
6.3K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.2K
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.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.2K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.5K
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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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.4K
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...
1.4K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Related Experiment Video

Updated: Nov 16, 2025

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
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Quantum interference between spin-orbit split partial waves in the F + HD → HF + D reaction.

Wentao Chen1, Ransheng Wang2, Daofu Yuan1

  • 1Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.

Science (New York, N.Y.)
|February 26, 2021
PubMed
Summary
This summary is machine-generated.

Electron spin-orbit interactions significantly influence chemical reactions. A study on F + HD reaction revealed a unique horseshoe pattern in scattering, explained by quantum interference effects.

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Area of Science:

  • Chemical Physics
  • Quantum Dynamics
  • Molecular Reaction Mechanisms

Background:

  • Electron spin-orbit interactions are crucial in chemical reaction dynamics.
  • Understanding these interactions is key to predicting reaction pathways.

Purpose of the Study:

  • To investigate the role of electron spin and orbital angular momentum in the F + HD reaction.
  • To elucidate the origins of unusual scattering patterns observed in this reaction.

Main Methods:

  • Combined experimental and theoretical approach.
  • High-resolution imaging technique for observing differential cross sections.
  • Accurate quantum dynamics calculations incorporating spin-orbit interactions.

Main Results:

  • Observed a peculiar horseshoe-shaped pattern in product rotational-state-resolved differential cross sections.
  • The pattern was primarily in the forward-scattering direction.
  • The pattern was successfully explained by quantum dynamics theory considering spin-orbit effects.

Conclusions:

  • Spin-orbit interaction profoundly impacts chemical reaction dynamics.
  • The horseshoe pattern arises from quantum interference between spin-orbit split resonances.
  • This study provides a distinct example of spin-orbit influence on reaction pathways.