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Related Concept Videos

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...
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...
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...
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...
Gas Chromatography–Mass Spectrometry (GC–MS)01:14

Gas Chromatography–Mass Spectrometry (GC–MS)

Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
A gas chromatograph consists of a long, narrow capillary column with a polysiloxane coating on the inner wall. The coating...
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...

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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

Published on: April 12, 2017

Gaseous trace analysis using pulsed photoacoustic Raman spectroscopy.

D R Siebert, G A West, J J Barrett

    Applied Optics
    |March 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel pulsed photoacoustic Raman spectroscopy (PARS) method enables trace gas analysis near 1 ppm for mixtures like methane in nitrogen. This technique offers a sensitive approach for detecting specific gas concentrations.

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    Published on: August 6, 2018

    Area of Science:

    • Analytical Chemistry
    • Spectroscopy
    • Environmental Science

    Background:

    • Trace gas analysis is crucial for environmental monitoring and industrial processes.
    • Existing techniques like direct absorption and other Raman methods have limitations in sensitivity or applicability.

    Purpose of the Study:

    • To introduce and detail a new method for trace gas analysis using pulsed photoacoustic Raman spectroscopy (PARS).
    • To evaluate the sensitivity and analytical capabilities of the PARS technique.
    • To compare PARS with other spectroscopic methods for gas analysis.

    Main Methods:

    • Utilized pulsed photoacoustic Raman spectroscopy (PARS) for gas detection.
    • Applied the PARS method to analyze mixtures of CH(4) in N(2), CO(2) in N(2), and N(2)O in N(2).
    • Investigated apparatus details, sensitivity improvements, and limiting factors.

    Main Results:

    • Successfully applied PARS to analyze gas mixtures at concentrations near 1 ppm.
    • Evaluated means to enhance sensitivity and identified sensitivity-limiting processes.
    • Compared the analytical performance of PARS with direct IR absorption, CARS, and SRGS.

    Conclusions:

    • Pulsed photoacoustic Raman spectroscopy (PARS) is a viable technique for trace gas analysis.
    • The PARS method demonstrates potential for sensitive detection of specific gases at low concentrations.
    • PARS offers competitive analytical capabilities compared to other Raman and IR techniques.