Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.5K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.5K
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

55.0K
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.
55.0K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.4K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.4K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

43.0K
sp3d and sp3d 2 Hybridization
43.0K
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

57.5K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
57.5K
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

11.0K
According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
11.0K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

[Characteristics of nitrogen accumulation and utilization in nitrogen-efficient rice under different ecological conditions].

Ying yong sheng tai xue bao = The journal of applied ecology·2026
Same author

DeepQuark: A Deep-Neural-Network Approach to Multiquark Bound States.

Physical review letters·2026
Same author

[Effect of Different Safety Utilization Measures on Reducing Cadmium in Rice in High Geological Background Area of Southeast Chongqing].

Huan jing ke xue= Huanjing kexue·2026
Same author

[Enrichment Characteristics and Risk Assessment of Heavy Metals in Soil-crop System of Cultivated Land Around a Mining Area].

Huan jing ke xue= Huanjing kexue·2025
Same author

Identification of the G(3900) Structure as the P-Wave DD[over ¯]^{*}/D[over ¯]D^{*} Resonance.

Physical review letters·2025
Same author

[Characteristics and Comprehensive Quality Assessment of Heavy Metals in Soil-crop System of High Geological Background Area].

Huan jing ke xue= Huanjing kexue·2024

Related Experiment Video

Updated: Nov 20, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

8.8K

Understanding pentaquark States in QCD.

Shi-Lin Zhu1

  • 1Department of Physics, Peking University, Beijing 100871, China.

Physical Review Letters
|December 20, 2003
PubMed
Summary

We estimate pentaquark state masses using QCD sum rules, finding states near 1.55 GeV. The Theta(+) baryon may be a pentaquark if its quantum numbers are J(P)=1/2(-), requiring experimental verification.

Area of Science:

  • Particle Physics
  • Quantum Chromodynamics (QCD)

Background:

  • Pentaquarks are exotic hadrons composed of five quarks.
  • The existence of pentaquarks is predicted by some quantum chromodynamics (QCD) models.
  • The experimentally observed Theta(+) baryon resonance presents a potential candidate for a pentaquark state.

Purpose of the Study:

  • To estimate the mass of pentaquark states using QCD sum rules.
  • To investigate the possibility of identifying the Theta(+) baryon as a pentaquark state.
  • To determine the expected quantum numbers for pentaquark states within QCD.

Main Methods:

  • Utilizing QCD sum rules to calculate theoretical masses of pentaquark configurations.
  • Comparing calculated masses with experimental observations of baryon resonances.

More Related Videos

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

9.4K
Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

8.8K

Related Experiment Videos

Last Updated: Nov 20, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

8.8K
Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

9.4K
Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

8.8K
  • Analyzing the quantum numbers (isospin, spin, parity, strangeness) of predicted and observed states.

    • Main Results:

    • Pentaquark states with isospin I=0, 1, and 2 are predicted to have masses clustering around (1.55 ± 0.15) GeV.
    • The Theta(+) (1540) baryon resonance, with strangeness S=+1, can be consistently identified as a pentaquark if its spin-parity is J(P)=1/2(-).
    • A pentaquark state with J(P)=1/2(-) is expected within the framework of QCD.

    Conclusions:

    • The mass estimation supports the existence of pentaquarks in the GeV range.
    • The Theta(+) baryon is a plausible pentaquark candidate, provided its spin-parity is 1/2(-).
    • Experimental determination of the Theta(+) baryon's precise quantum numbers is crucial to confirm its pentaquark nature and distinguish between standard and exotic possibilities.