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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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.
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
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Hyperfine-structure-induced purely long-range molecules.

Katsunari Enomoto1, Masaaki Kitagawa, Satoshi Tojo

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.

Physical Review Letters
|June 4, 2008
PubMed
Summary

Researchers discovered a new type of purely long-range molecule, formed by weak hyperfine interactions. This finding, observed using photoassociation spectroscopy of ultracold ytterbium-171 atoms, reveals the shallowest molecular potential depth yet recorded.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Purely long-range molecules are typically formed by weak interactions.
  • Hyperfine interactions are usually considered minor perturbations in molecular spectroscopy.
  • Ultracold atom experiments enable the study of exotic molecular states.

Purpose of the Study:

  • To experimentally observe and theoretically identify a novel class of purely long-range molecules.
  • To investigate the role of weak hyperfine interactions in molecular state formation.
  • To characterize the properties of these newly identified molecules, including their potential depth.

Main Methods:

  • Photoassociation spectroscopy was employed using ultracold ytterbium-171 (171Yb) atoms.
  • The 1S0-3P1 intercombination transition was utilized for atom-molecule coupling.
  • Theoretical analysis was performed to identify and characterize the molecular states.

Main Results:

  • A novel class of purely long-range molecules was experimentally observed and theoretically identified.
  • The formation mechanism involves a very weak hyperfine interaction.
  • The shallowest molecular potential depth of approximately 750 MHz was determined for these molecules.

Conclusions:

  • This study reveals a new pathway for forming purely long-range molecules via hyperfine interactions.
  • The observed molecules represent the shallowest potential depth among purely long-range molecules to date.
  • The findings contribute to a deeper understanding of molecular interactions and spectroscopy in ultracold atomic systems.