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

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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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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.
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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.
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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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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.
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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Probing ^{93m}Mo Isomer Depletion with an Isomer Beam.

S Guo1,2, B Ding1,2, X H Zhou1,2

  • 1Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.

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|July 1, 2022
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Summary

Researchers reexamined nuclear excitation by electron capture (NEEC) in ^{93m}Mo. The study found no evidence for isomer depletion, contradicting previous findings and suggesting NEEC may not occur as reported.

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Area of Science:

  • Nuclear Physics
  • Atomic Physics
  • Quantum Mechanics

Background:

  • Nuclear excitation by electron capture (NEEC) is a proposed mechanism for exciting atomic nuclei via electron interactions.
  • A recent study reported the first direct observation of NEEC in ^{93m}Mo, with a measured excitation probability significantly higher than theoretical predictions.

Purpose of the Study:

  • To investigate the discrepancy between experimental and theoretical values for NEEC.
  • To re-examine the phenomenon of isomer depletion in ^{93m}Mo under controlled experimental conditions.
  • To determine the excitation probability of NEEC with greater accuracy.

Main Methods:

  • ^{93m}Mo nuclei were produced via the ^{12}C(^{86}Kr,5n) reaction at 559 MeV.
  • Reaction residues were transported using a secondary beam line to a low-background detection station.
  • Isomer depletion was analyzed during the ion slowdown process in a stopping material.

Main Results:

  • No signature of isomer depletion was observed in the low-γ-ray background environment.
  • An upper limit for the excitation probability was estimated at 2×10^{-5}.
  • The experimental upper limit is consistent with theoretical expectations for NEEC.

Conclusions:

  • The findings cast doubt on the previously reported observation of NEEC in ^{93m}Mo.
  • Further experimental investigations are necessary to re-evaluate isomer depletion under low-background conditions.
  • The study highlights the importance of rigorous experimental verification in nuclear physics research.