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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

381
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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
381
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

340
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
340

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Related Experiment Video

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Fluid-cell Raman Spectroscopy for operando Studies of Reaction and Transport Phenomena during Silicate Glass Corrosion
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Photon-Momentum-Enabled Electronic Raman Scattering in Silicon Glass.

Sergey S Kharintsev1, Elina I Battalova1, Aleksey I Noskov1,2

  • 1Department of Optics and Nanophotonics, Institute of Physics, Kazan Federal University, Kazan 420008, Russia.

ACS Nano
|March 4, 2024
PubMed
Summary

Structural disorder in silicon glass drives enhanced photoemission through electronic Raman scattering, not phonon-assisted transitions. This phenomenon involves trapped electrons and photon momentum, offering new insights into light emission in nanostructured materials.

Keywords:
Compton scatteringUrbach bridgeelectronic Raman scatteringphoton momentumsemiconductor glassstructural optical spectroscopy

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Area of Science:

  • Solid-state physics
  • Materials science
  • Nanotechnology

Background:

  • Enhanced photoemission in disordered and amorphous solids, particularly nanostructured silicon, remains incompletely understood.
  • Crystalline semiconductors typically do not exhibit the observed light emission phenomena.

Purpose of the Study:

  • To investigate structural photoemission in heterogeneous cross-linked silicon glass, a model system bridging amorphous and crystalline states.
  • To elucidate the mechanisms underlying photoemission in this disordered material, exploring the roles of size, disorder, and electronic transitions.

Main Methods:

  • Studied photoemission in heterogeneous cross-linked silicon glass with a narrow distribution of structure sizes.
  • Analyzed the dependence of photoemission on size and disorder across various energy ranges.
  • Compared experimental observations with phonon-assisted indirect optical transitions and electronic Raman scattering models.

Main Results:

  • Observed a clear dependence of photoemission on size and disorder in silicon glass.
  • Found that phonon-assisted transitions were insufficient to explain the observed emissions.
  • Identified electronic Raman scattering as the dominant mechanism, driven by structural disorder and trapped electrons in the band gap (Urbach bridge).

Conclusions:

  • Photoemission in disordered silicon glass is primarily governed by electronic Raman scattering, not phonon-assisted transitions.
  • The presence of excess electron states within the band gap and electron-photon momentum matching are crucial.
  • Photon momentum plays a significant role in the optical response of nanoscale disordered solids.