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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Updated: Jan 17, 2026

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
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Probing electron topology with Raman scattering.

Natalia Drichko1, Predrag Nikolic1,2

  • 1Institute for Quantum Matter at Johns Hopkins University, Baltimore, MD 21218, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 17, 2025
PubMed
Summary
This summary is machine-generated.

Raman scattering is a powerful tool for studying topological quantum materials. This technique can detect Weyl electrons and quadratic band touching, providing insights into their properties.

Keywords:
Raman scatteringWeyl and Dirac electronstopological phase transitionstopological quantum materials

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Nodal electron spectra are key features of topological quantum materials.
  • Experimentally probing these nodal spectra, especially their relativistic density of states, remains challenging.

Purpose of the Study:

  • To review recent advancements in observing and measuring Weyl electron properties using Raman scattering.
  • To highlight Raman scattering's capability as a sensitive probe for Weyl electrons and quadratic band touching.

Main Methods:

  • Utilizing Raman scattering as a zero-momentum probe.
  • Analyzing the relativistic density of states characteristic of nodal electron spectra.

Main Results:

  • Raman scattering can detect Weyl electrons, a signature of topological quantum materials.
  • This method allows for the extraction of Fermi energy, Fermi momentum, and estimation of Weyl electron lifetime.
  • The technique is also applicable to detecting quadratic band touching.

Conclusions:

  • Raman scattering is a versatile and sensitive technique for characterizing topological quantum materials.
  • It offers a non-destructive method to probe exotic electronic properties influenced by interactions and disorder.