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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...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
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...
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...

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Updated: May 14, 2026

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

Second-order Raman scattering in CuO.

A P Litvinchuk1, A Möller, L Debbichi

  • 1Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5002, USA. Litvin@central.uh.edu

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 8, 2013
PubMed
Summary
This summary is machine-generated.

Second-order Raman scattering in copper oxide (CuO) single crystals reveals dominant two-phonon processes. These findings are crucial for understanding phonon behavior and material properties.

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Observation and Analysis of Blinking Surface-enhanced Raman Scattering
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Observation and Analysis of Blinking Surface-enhanced Raman Scattering
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Area of Science:

  • Solid State Physics
  • Materials Science
  • Spectroscopy

Background:

  • Raman scattering is a key technique for probing vibrational properties of materials.
  • Understanding phonon behavior in metal oxides like CuO is essential for their applications.

Purpose of the Study:

  • To investigate polarized second-order Raman scattering spectra of CuO single crystals.
  • To analyze selection rules for first- and second-order Raman scattering.
  • To calculate phonon dispersion relations and assign spectral features.

Main Methods:

  • Experimental measurement of polarized second-order Raman scattering spectra.
  • Group-theoretical symmetry analysis of Raman scattering selection rules.
  • First-principles calculations using density functional theory for phonon dispersion.

Main Results:

  • Second-order Raman scattering processes were found to dominate in specific scattering geometries.
  • The main features in the two-phonon spectra were assigned to overtones of specific vibrational branches.
  • Phonon dispersion relations were calculated and correlated with spectral features.

Conclusions:

  • Second-order Raman scattering provides valuable insights into the vibrational dynamics of CuO.
  • The study successfully assigned spectral features to specific phonon overtones.
  • This work contributes to a deeper understanding of phonon interactions in CuO single crystals.