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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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...
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Raman Spectroscopy: Overview01:20

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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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

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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...
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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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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.
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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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...
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
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Development of chemometric models to classify solid-state U materials by micro-Raman spectroscopy.

Luke R Sadergaski1, Hunter B Andrews1, Tyler L Spano2

  • 1Radioisotope Science and Technology Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37830, USA.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|September 30, 2025
PubMed
Summary

This study developed a Raman spectroscopy method using SIMCA to classify uranium compounds like α-uranium trioxide, uranium dioxide, and others. This technique accurately distinguishes uranium materials from background samples for environmental monitoring.

Keywords:
ActinideMappingMultivariate analysisOptical spectroscopyOxide

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Monitoring the peaceful use of nuclear material requires accurate identification of uranium particles in environmental samples.
  • Distinguishing various uranium compounds and differentiating them from matrix materials is crucial for nuclear forensics and industrial applications.

Purpose of the Study:

  • To develop a chemometric model for classifying four distinct uranium compounds using Raman spectroscopy.
  • To assess the model's ability to differentiate uranium particles from matrix materials and outliers.

Main Methods:

  • Development of a Soft Independent Modeling of Class Analogy (SIMCA) library for Raman spectral data.
  • Utilizing both unsupervised and supervised chemometric models to account for spectral variability.
  • Classification of α-U3O8, UO2, UO2(NO3)2·6H2O (UNH), and UO2O2·4H2O (studtite) particles.

Main Results:

  • A supervised SIMCA model demonstrated good sensitivity and high specificity for classifying uranium compounds.
  • Spectral variability related to particle size, hydration, and oxide phase was observed within classes.
  • The method successfully distinguished uranium materials from matrix particulates like flint clay.

Conclusions:

  • Raman spectroscopy combined with chemometrics provides a reliable method for distinguishing uranium materials.
  • The developed approach offers a rapid, non-destructive technique for characterizing uranium compounds in environmental and forensic contexts.