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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Covalent bonds are formed between two atoms when both have similar tendencies to attract electrons to themselves (i.e., when both atoms have identical or fairly similar ionization energies and electron affinities). Nonmetal atoms frequently form covalent bonds with other nonmetal atoms. For example, the hydrogen molecule, H2, contains a covalent bond between its two hydrogen atoms. When two separate hydrogen atoms with a particular potential energy approach each other, their valence orbitals...
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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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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...
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Spatial Separation of Molecular Conformers and Clusters
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Alignment transport between ultracold polar molecules.

Jonathan Smucker1, Jesus Pérez-Ríos1

  • 1Department of Physics and Astronomy, Stony Brook University, Stony Brook, 11790, USA. jonathan.smucker@stonybrook.edu.

Physical Chemistry Chemical Physics : PCCP
|July 31, 2024
PubMed
Summary

Ultracold polar molecules can transfer alignment via dipole-dipole interactions. This alignment transport is observable in experiments within microseconds, paving the way for new molecular studies.

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Area of Science:

  • Quantum Chemistry
  • Molecular Physics
  • Atomic Physics

Background:

  • Ultracold polar molecules offer a novel platform for studying fundamental quantum phenomena.
  • Alignment transport between molecules is a key process for quantum information transfer and control.

Purpose of the Study:

  • To propose and investigate the transport of molecular alignment in an array of ultracold polar molecules.
  • To elucidate the mechanisms governing alignment transfer mediated by dipole-dipole interactions.

Main Methods:

  • Theoretical modeling of ultracold polar molecules in intense laser fields.
  • Analysis of electric field-driven excitations and dipole-dipole interactions.
  • Simulation using sodium-cesium (NaCs) as a prototype molecule.

Main Results:

  • Alignment transfer between molecules is driven by a combination of electric field excitations and dipole-dipole interactions.
  • The study identifies and analyzes all contributing mechanisms for alignment transfer.
  • The characteristic timescale for alignment transfer is on the order of 10 microseconds for NaCs molecules.

Conclusions:

  • Alignment transport in ultracold polar molecules is a feasible and observable phenomenon.
  • The findings provide a foundation for utilizing molecular alignment for quantum information processing and control.
  • The short timescale makes this system experimentally accessible for further research.