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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...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...

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Related Experiment Video

Updated: Jun 9, 2026

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
15:04

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy

Published on: May 18, 2011

[Raman spectra quantitative analysis on materials with strong fluorescence background].

Zheng-jie Wu1, Yao-xiong Huang, Cheng Wang

  • 1Institute of Biomedical Engineering, Jinan University, Guangzhou 510632, China. wuzhengjiemoon@163.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|September 11, 2010
PubMed
Summary

This study introduces a new normalization method for Raman spectra quantitative analysis, effectively handling strong fluorescence backgrounds. The method achieves high accuracy and reduces data fluctuations for precise material content determination.

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Last Updated: Jun 9, 2026

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy

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A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Context:

  • Quantitative analysis of materials using Raman spectroscopy is often hindered by strong fluorescence backgrounds.
  • Baseline correction and normalization are crucial steps in processing Raman spectra.
  • Data acquisition variability can introduce fluctuations, impacting analytical accuracy.

Purpose:

  • To develop and validate a novel normalization method for Raman spectra quantitative analysis.
  • To address challenges posed by strong fluorescence backgrounds in spectral data.
  • To evaluate the method's effectiveness in mitigating data fluctuations from space-time variations.

Summary:

  • A new normalization method was applied to methanol and ethanol-methanol solutions with strong fluorescence backgrounds for concentration analysis.
  • The method demonstrated high accuracy, achieving a mean relative error of 4.7% for methanol quantification.
  • Randomized blocks analysis of variance confirmed the method's ability to reduce inter-group data fluctuations, with a relative standard deviation of 4.2%.

Impact:

  • Enables simple, quick, and precise quantitative determination of sample content in materials with strong fluorescence.
  • Improves the reliability and accuracy of Raman spectroscopy for complex samples.
  • Provides a robust approach for handling spectral data variability in quantitative analysis.