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¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
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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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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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Observation of the h(c)(1P) Using e+ e- collisions above the DD threshold.

T K Pedlar1, D Cronin-Hennessy, J Hietala

  • 1Luther College, Decorah, Iowa 52101, USA.

Physical Review Letters
|August 27, 2011
PubMed
Summary
This summary is machine-generated.

Researchers observed the process e+ e- → π+ π- hc(1P) using electron-positron collision data. They measured its cross section and found evidence for e+ e- → ηhc(1P), with hints of a cross-section rise.

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Area of Science:

  • High-energy particle physics
  • Experimental particle physics
  • Quantum chromodynamics

Background:

  • The study of charmonium spectroscopy is crucial for understanding the strong force.
  • Investigating the production of charmonium states in electron-positron collisions provides insights into fundamental interactions.

Purpose of the Study:

  • To observe and measure the cross section of the process e+ e- → π+ π- hc(1P).
  • To search for evidence of the process e+ e- → ηhc(1P).
  • To investigate the behavior of the e+ e- → π+ π- hc(1P) cross section at different energies.

Main Methods:

  • Utilizing 586 pb⁻¹ of e+ e- collision data collected with the CLEO-c detector at the Cornell Electron Storage Ring.
  • Analyzing data at a center-of-mass energy of 4170 MeV.
  • Employing normalization with the branching fraction of ψ(2S) → π0 hc(1P).

Main Results:

  • Observed the process e+ e- → π+ π- hc(1P) with a measured cross section of 15.6±2.3±1.9±3.0 pb.
  • Found evidence for e+ e- → ηhc(1P) at 4170 MeV at the 3σ significance level.
  • Observed hints of an increasing cross section for e+ e- → π+ π- hc(1P) at 4260 MeV.

Conclusions:

  • The study provides precise measurements of charmonium production in e+ e- collisions.
  • The findings contribute to the understanding of the excited charmonium spectrum and strong interaction dynamics.
  • Further investigation at different energy points may reveal more about the nature of these particle interactions.