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

Angular Momentum: Single Particle01:10

Angular Momentum: Single Particle

6.1K
Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
6.1K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

1.3K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
1.3K
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

1.3K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
1.3K
Magnetic Moment of an Electron01:23

Magnetic Moment of an Electron

1.3K
Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
1.3K
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

1.1K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
1.1K
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

1.2K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.2K

You might also read

Related Articles

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

Sort by
Same author

Injectable Thermal-Protective Hydrogel Enables Curative Tumor Ablation via Chemo-Immunomodulation.

ACS applied materials & interfaces·2026
Same author

H<sub>2</sub>O<sub>2</sub>-independent oxygen activation via proton-coupled electron transfer for selective hydroxyl radical generation.

Water research·2026
Same author

Opposing intracellular redox modulation by a carrier-free diselenide nanosystem integrates antifibrosis and ferroptosis sensitization for fibrotic pancreatic cancer therapy.

Biomaterials·2026
Same author

<i>Lactiplantibacillus plantarum</i> KLDS1.0344 ameliorates depressive-like behavior in CUMS mice: integrative multi-omics evidence linking gut microbiota alterations to sphingolipid and glycerophospholipid metabolic pathways.

Food & function·2026
Same author

Selective Two-Electron Phenol Oxidation Polymerization for Water Purification.

Angewandte Chemie (International ed. in English)·2026
Same author

Light-Activated Ruthenium Nanoclusters Reprogram the Metabolic-Quorum Sensing Axis for Precision Periodontitis Therapy.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026

Related Experiment Video

Updated: Jun 28, 2025

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

7.1K

Phonon Pseudoangular Momentum in α-MoO3.

Meiqi Li1, Zhibing Li2,3,4, Huanjun Chen3,4,5

  • 1School of Physics, Sun Yat-sen University, Guangzhou 510275, China.

Nanomaterials (Basel, Switzerland)
|April 12, 2024
PubMed
Summary
This summary is machine-generated.

Phonons can carry pseudoangular momentum in two-fold screw rotational symmetry crystals like alpha-molybdenum trioxide (α-MoO3). This discovery guides circularly polarized Raman experiments and unlocks new applications.

Keywords:
helicity-selective Raman scatteringphononpseudoangular momentumselection rule

More Related Videos

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
07:52

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer

Published on: April 12, 2017

12.8K
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

8.5K

Related Experiment Videos

Last Updated: Jun 28, 2025

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

7.1K
A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
07:52

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer

Published on: April 12, 2017

12.8K
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

8.5K

Area of Science:

  • Condensed matter physics
  • Solid-state physics
  • Phononics

Background:

  • Recent studies reveal phonons can carry angular momentum, primarily in three-fold rotationally symmetric systems.
  • Systems with two-fold screw rotational symmetry, like α-MoO3, lack exploration regarding phonon angular momentum.

Purpose of the Study:

  • To investigate pseudoangular momentum of phonons in crystals exhibiting two-fold screw rotational symmetry.
  • To elucidate selection rules for circularly polarized Raman spectroscopy based on pseudoangular momentum conservation in α-MoO3.

Main Methods:

  • Theoretical investigation of phonon pseudoangular momentum.
  • Analysis of selection rules in circularly polarized Raman scattering experiments.
  • Case study using alpha-molybdenum trioxide (α-MoO3) as a representative material.

Main Results:

  • Demonstrated the existence and properties of phonon pseudoangular momentum in two-fold screw symmetric crystals.
  • Established clear selection rules for Raman experiments linked to pseudoangular momentum conservation.
  • Identified α-MoO3 as a key material for studying these phenomena.

Conclusions:

  • The study introduces pseudoangular momentum as a crucial property for phonons in two-fold screw symmetric systems.
  • Provides experimental guidance for Raman spectroscopy, enabling the detection and manipulation of phonon pseudoangular momentum.
  • Opens new avenues for utilizing phonon pseudoangular momentum in α-MoO3 for advanced applications.