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Related Concept Videos

2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
Thomson's e/m Experiment01:19

Thomson's e/m Experiment

In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
The de Broglie Wavelength02:32

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.

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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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First Observation of Deuteron-Λ Correlations at RHIC.

B E Aboona1, J Adam2, L Adamczyk3

  • 1Texas A&M University, College Station, Texas 77843.

Physical Review Letters
|July 7, 2026
PubMed
Summary

Researchers measured correlations between deuterons and Lambda (Λ) hyperons in heavy-ion collisions. This provides new insights into hyperon-nucleon interactions and the structure of neutron stars.

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Astrophysics

Background:

  • Understanding hyperon-nucleon interactions is crucial for comprehending the internal structure of compact stars.
  • Experimental data on these interactions are currently limited.

Purpose of the Study:

  • To present the first experimental results on deuteron-Λ hyperon correlation functions.
  • To extract spin-dependent strong interaction parameters and source size.

Main Methods:

  • Analysis of deuteron-Λ hyperon correlation functions in Au+Au collisions at $\sqrt{s_{NN}}$=3.0 GeV.
  • Bayesian inference analysis using the Lednický-Lyuboshitz formalism.
  • Extraction of scattering length ($f_{0}$) and effective range ($d_{0}$).

Main Results:

  • Observed a clear enhancement in the correlation function at small relative momenta.
  • Extracted source size parameters as a function of collision centrality.
  • Determined spin-dependent strong interaction parameters for the deuteron-Λ system.

Conclusions:

  • The extracted parameters provide a novel method for determining Λ separation energy in hypernuclei like hypertriton.
  • These findings contribute to a deeper understanding of matter under extreme conditions found in compact stars.