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Related Concept Videos

Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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Double Resonance Techniques: Overview01:12

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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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Resonance02:52

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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds. 
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¹H NMR: Long-Range Coupling01:27

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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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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Van der Waals Interactions01:24

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Related Experiment Video

Updated: Aug 9, 2025

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Resonances in Non-universal Dipolar Collisions.

Tijs Karman1

  • 1Institute for Molecules and Materials, Radboud University, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.

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|February 24, 2023
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Summary

Theoretical study of ultracold molecules reveals scattering resonances from dipole-dipole interactions. A new coupled-channel method efficiently models short-range boundary conditions, showing how resonances emerge as loss probability decreases.

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Area of Science:

  • Quantum physics
  • Ultracold molecular physics

Background:

  • Dipole-dipole interactions are crucial for ultracold molecule behavior.
  • Controlling molecular interactions is key to quantum technologies.

Purpose of the Study:

  • Investigate scattering resonances in ultracold molecules.
  • Develop a computational method for analyzing molecular interactions.
  • Explore the role of short-range boundary conditions.

Main Methods:

  • Theoretical modeling of dipole-dipole interactions.
  • Coupled-channel calculations with efficient short-range boundary conditions.
  • Application of quantum defect theory principles.

Main Results:

  • Resonances appear as short-range loss probability decreases below unity.
  • The developed method efficiently handles complex boundary conditions.
  • Identified conditions for resonance observation in specific potentials.

Conclusions:

  • Scattering resonances are sensitive to short-range loss probabilities.
  • The new computational approach facilitates the study of ultracold molecular interactions.
  • Potential for experimental realization with nonreactive molecules in blue-detuned box potentials.