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Related Concept Videos

¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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

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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

6.2K
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...
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.3K
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...
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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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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Evidence for X(3872)→J/ψπ^{+}π^{-} Produced in Single-Tag Two-Photon Interactions.

Y Teramoto1, S Uehara2,3, M Masuda4,5

  • 1Osaka City University, Osaka 558-8585.

Physical Review Letters
|April 9, 2021
PubMed
Summary
This summary is machine-generated.

Researchers found the first evidence of X(3872) particle production in two-photon interactions using Belle detector data. This discovery explores the highly virtual photon region and provides new insights into exotic meson physics.

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Area of Science:

  • Particle Physics
  • Quantum Chromodynamics
  • Hadron Spectroscopy

Background:

  • The X(3872) is an exotic charmonium state, whose nature is still debated.
  • Understanding its production mechanisms provides crucial insights into the strong interaction.

Purpose of the Study:

  • To search for evidence of X(3872) production in two-photon interactions.
  • To explore the highly virtual photon region and its role in exotic meson production.

Main Methods:

  • Analysis of 825 fb^{-1} of data collected by the Belle detector at the KEKB e^{+}e^{-} collider.
  • Tagging either the electron or the positron in the final state of e^{+}e^{-}→e^{+}e^{-}J/ψπ^{+}π^{-} interactions.
  • Statistical analysis to determine the significance of observed candidates against expected background.

Main Results:

  • Observation of three X(3872) candidates in two-photon interactions with a significance of 3.2σ.
  • Estimation of the two-photon decay width times branching ratio, Γ[over ˜]_{γγ}B(X(3872)→J/ψπ^{+}π^{-}).
  • No significant signal for X(3915)→J/ψπ^{+}π^{-} was found.

Conclusions:

  • The first evidence for X(3872) production in two-photon interactions is reported.
  • This finding opens new avenues for studying exotic hadrons in the virtual photon region.
  • The results contribute to a deeper understanding of the internal structure of exotic mesons.