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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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 the...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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 the...
IR Spectrum Peak Intensity: Amount of IR-Active Bonds00:55

IR Spectrum Peak Intensity: Amount of IR-Active Bonds

When infrared radiation is passed through a molecule, absorption occurs if the molecule's vibration leads to a substantial change in its bond dipole moment. Transitions between vibrational energy levels, typically corresponding to infrared frequencies (4000–400 cm−1), allow absorption if the vibration significantly alters the dipole moment, making the molecule infrared active. The molecular bonds have different stretching and bending vibrations, resulting in various peaks with varying...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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IR Spectrum Peak Intensity: Dipole Moment01:20

IR Spectrum Peak Intensity: Dipole Moment

The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...

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  3. Correlation Between Band Gap And Raman Intensity.
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Related Experiment Video

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
07:44

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Published on: April 28, 2016

Correlation between band gap and Raman intensity.

Sheng-Hai Zhu1, Han Qin2, Xin-Lu Cheng1

  • 1Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China. chengxl@scu.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|June 16, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Raman spectroscopy reveals a quantitative link between material band gap and Raman intensity. Increased Raman intensity correlates with a decreased band gap in semiconductors, offering new applications for this technique.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Solid-State Physics

Background:

  • Raman spectroscopy is primarily used for qualitative analysis of material structural features.
  • Quantitative analysis of Raman intensity changes remains underexplored.
  • Understanding material properties requires deeper insights beyond peak positions.

Purpose of the Study:

  • To establish a quantitative relationship between Raman intensity and the band gap of semiconductors.
  • To explore the potential of Raman intensity for predicting electronic band structure changes.
  • To expand the application scope of Raman spectroscopy in materials characterization.

Main Methods:

  • Theoretical calculations of Raman spectra and electronic structures for semiconductors under varying pressures.
  • Statistical analysis to identify correlations between spectral features and material properties.
  • Development of a formula linking Raman intensity to band gap.

    • Main Results:

    • A direct correlation was established between Raman intensity and band gap.
    • An increase in Raman intensity was consistently observed with a decrease in band gap.
    • Theoretical models accurately predicted these quantitative spectral changes.

    Conclusions:

    • Raman intensity provides a quantitative measure of semiconductor band gap.
    • This finding offers a new perspective for utilizing Raman spectroscopy in materials science.
    • The established formula can aid in predicting electronic properties through spectral analysis.