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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
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Intermolecular Forces03:13

Intermolecular Forces

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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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Intermolecular vs Intramolecular Forces03:00

Intermolecular vs Intramolecular Forces

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Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
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Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy
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Ultrafast intermolecular zero quantum spectroscopy.

Gigi Galiana1, Rosa T Branca, Warren S Warren

  • 1Princeton University, Department of Chemistry, Princeton, New Jersey, USA.

Journal of the American Chemical Society
|December 15, 2005
PubMed
Summary
This summary is machine-generated.

Intermolecular zero quantum coherences (iZQCs) offer magnetic resonance spectroscopy free from magnetic field inhomogeneities. Ultrafast acquisition overcomes physiological fluctuations, improving in vivo spectral resolution.

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Area of Science:

  • Biophysics
  • Magnetic Resonance Imaging
  • Spectroscopy

Background:

  • Clinical magnetic resonance spectroscopy (MRS) faces challenges with spectral resolution due to magnetic field inhomogeneities.
  • Intermolecular zero quantum coherences (iZQCs) are inherently insensitive to these magnetic inhomogeneities.
  • Current iZQC techniques are limited by physiological fluctuations during lengthy 2D acquisitions, hindering in vivo resolution.

Purpose of the Study:

  • To develop a faster iZQC sequence for improved in vivo magnetic resonance spectroscopy.
  • To overcome limitations imposed by physiological fluctuations in 2D spectral acquisitions.
  • To enhance spectral resolution in iZQC experiments.

Main Methods:

  • Implementation of an ultrafast two-dimensional spectroscopy approach.
  • Acquisition of iZQC experiments with up to 31 t1-points per scan.
  • Adaptation of the ultrafast method to various other 2D spectroscopic sequences.

Main Results:

  • Demonstrated feasibility of acquiring iZQC experiments with significantly increased t1-points.
  • Successfully reduced the impact of physiological fluctuations through faster acquisition.
  • Achieved enhanced spectral resolution in vivo using the novel ultrafast sequence.

Conclusions:

  • Ultrafast 2D spectroscopy is a viable method to overcome physiological noise in iZQC experiments.
  • The developed sequence significantly improves spectral resolution for in vivo magnetic resonance spectroscopy.
  • This approach broadens the applicability of iZQCs in clinical settings.