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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Atomic Emission Spectroscopy: Lab01:29

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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...
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle

Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
Gas Chromatography–Mass Spectrometry (GC–MS)01:14

Gas Chromatography–Mass Spectrometry (GC–MS)

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Spectroscopy in the gas phase with GaAs/AlGaAs quantum-cascade lasers.

L Hvozdara1, S Gianordoli, G Strasser

  • 1Institute for Solid State Electronics, Technical University of Vienna, Gusshausstrasse 25-29y362, A-1040 Vienna, Austria.

Applied Optics
|March 21, 2008
PubMed
Summary

This study showcases the first use of quantum-cascade lasers for spectroscopic gas sensing. The system achieved a 250 parts per million detection limit for ethene using a hollow waveguide.

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Area of Science:

  • Optoelectronics
  • Spectroscopy
  • Environmental Science

Background:

  • Quantum-cascade lasers (QCLs) offer unique mid-infrared emission properties.
  • Hollow waveguides provide a robust platform for gas absorption measurements.
  • Mid-infrared spectroscopy is crucial for identifying and quantifying various gases.

Purpose of the Study:

  • To demonstrate the first application of electrically pumped GaAs/AlGaAs quantum-cascade lasers in a gas-sensing system.
  • To investigate the mid-infrared absorption spectrum of ethene using a hollow waveguide.
  • To establish the detection limit of this novel spectroscopic setup.

Main Methods:

  • Utilized electrically pumped GaAs/AlGaAs quantum-cascade lasers emitting at 10.009 microm.
  • Employed a 434-mm-long silver-coated silica hollow waveguide as a gas absorption cell.
  • Analyzed laser transmission through ethene/helium mixtures with a Fourier-transform infrared spectrometer.

Main Results:

  • Successfully measured the mid-infrared absorption spectrum of ethene at atmospheric pressure.
  • Experimental results showed good agreement with calculated ethene spectra.
  • Achieved a detection threshold of 250 parts per million (ppm) for ethene.

Conclusions:

  • Electrically pumped GaAs/AlGaAs quantum-cascade lasers are effective for spectroscopic gas sensing.
  • Hollow waveguides enhance gas-sensing capabilities in mid-infrared spectroscopy.
  • The developed system shows promise for sensitive ethene detection.