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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...
Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
Flame Photometry: Overview01:02

Flame Photometry: Overview

Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...

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Related Experiment Video

Updated: May 28, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Raman Spectroscopy for Monitoring NOx and N2O in Combustion Products.

Riccardo Dal Moro1, Fabio Melison1, Lorenzo Cocola1

  • 1National Research Council of Italy, Institute for Photonics and Nanotechnologies, CNR-IFN, Via Trasea 7, 35131 Padova, Italy.

Sensors (Basel, Switzerland)
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

A cost-effective Raman spectroscopy system accurately quantifies nitrogen oxides (NO and NO2) and nitrous oxide (N2O) in combustion. This advancement supports alternative fuel applications by enabling flexible, multi-species gas analysis.

Keywords:
NO2NOxRaman spectroscopycombustioncombustion diagnosticgas sensing

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

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Nitrogen Compound Characterization in Fuels by Multidimensional Gas Chromatography
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Nitrogen Compound Characterization in Fuels by Multidimensional Gas Chromatography

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Related Experiment Videos

Last Updated: May 28, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

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

Nitrogen Compound Characterization in Fuels by Multidimensional Gas Chromatography
08:22

Nitrogen Compound Characterization in Fuels by Multidimensional Gas Chromatography

Published on: May 15, 2020

Area of Science:

  • Chemical Physics
  • Spectroscopy
  • Combustion Analysis

Background:

  • Alternative fuels like hydrogen and ammonia necessitate advanced combustion monitoring.
  • Raman spectroscopy offers non-intrusive, multi-species gas analysis without sample prep.
  • Accurate diagnostics are crucial for optimizing alternative fuel combustion.

Purpose of the Study:

  • To evaluate a cost-effective Raman spectroscopy system for quantifying nitrogen oxides (NOx) and nitrous oxide (N2O).
  • To assess the system's performance in emerging combustion applications.
  • To expand industrial applicability of Raman spectroscopy for gas diagnostics.

Main Methods:

  • Utilized a multi-pass optical configuration to enhance Raman signal.
  • Employed off-the-shelf components, including an uncooled CMOS detector.
  • Performed calibration with known gas mixtures and analyzed spectra using nonlinear least-squares fitting.

Main Results:

  • Demonstrated linear and repeatable responses for NO and N2O across investigated pressure ranges.
  • Achieved low mean errors and limited data dispersion for NO and N2O.
  • Encountered challenges quantifying NO2 due to its high reactivity under test conditions.

Conclusions:

  • The developed Raman system is a viable, cost-effective solution for multi-species gas analysis.
  • The system shows promise for diagnostics in alternative fuel combustion applications.
  • Further work may be needed to fully quantify NO2 performance in reactive environments.