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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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.
Spin decoupling is usually achieved by...
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not immune...
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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.
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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...
Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

Progress towards understanding baryon resonances.

V Crede1, W Roberts

  • 1Florida State University, Department of Physics, Tallahassee, FL 32306, USA. crede@fsu.edu

Reports on Progress in Physics. Physical Society (Great Britain)
|June 22, 2013
PubMed
Summary
This summary is machine-generated.

Baryon spectroscopy reveals a complex spectrum of excited states. Recent experiments using photons and electrons offer new insights into nucleon excitations and heavy baryons, challenging previous findings.

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Area of Science:

  • Particle Physics
  • Nuclear Physics
  • Quantum Chromodynamics

Background:

  • Baryons exhibit a rich spectrum of excited states, particularly in the 1-2 GeV mass region for light flavors.
  • The fundamental degrees of freedom governing baryon excitation spectra remain poorly understood despite decades of research.
  • The search for predicted but undiscovered baryon resonances is ongoing globally.

Purpose of the Study:

  • To review recent experimental progress in baryon spectroscopy.
  • To provide an overview of theoretical approaches to understanding baryon structure.
  • To highlight new findings in both light and heavy baryon sectors.

Main Methods:

  • Systematic investigations using electromagnetic probes (electrons, photons) and strong probes (pions).
  • Analysis of photo- and electroproduction experiments.
  • Exploitation of data from B factories, Tevatron, and the Large Hadron Collider for heavy baryons.

Main Results:

  • Intriguing indications for new baryon states from recent photo- and electroproduction experiments.
  • New insights into the structure of known nucleon excitations.
  • Questioning of earlier findings in baryon spectroscopy due to new observables and analysis tools.
  • Significant progress in the heavy-baryon sector, especially bottom baryons, with early results from the Large Hadron Collider.

Conclusions:

  • Recent experimental advancements are shedding light on the complex baryon spectrum.
  • Ongoing research continues to uncover new states and refine our understanding of baryon structure.
  • Theoretical and experimental efforts are crucial for a comprehensive understanding of fundamental degrees of freedom in baryons.