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Related Concept Videos

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...
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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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Instantaneous temperature imaging of diffusion flames using two-line atomic fluorescence.

Paul R Medwell1, Qing N Chan, Peter A M Kalt

  • 1School of Mechanical Engineering, The University of Adelaide, S.A. 5005 Australia. paul.medwell@adelaide.edu.au

Applied Spectroscopy
|February 13, 2010
PubMed
Summary
This summary is machine-generated.

This study demonstrates nonlinear regime two-line atomic fluorescence (NTLAF) thermometry in flames. The technique accurately measures temperatures exceeding 1000 K in the reaction zone, offering insights into indium atomization.

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Area of Science:

  • Combustion science
  • Laser-based diagnostics
  • Thermometry

Background:

  • Accurate temperature measurement is crucial for understanding combustion processes.
  • Traditional methods face challenges in complex flame environments.
  • Atomic fluorescence thermometry offers a potential solution for in-situ measurements.

Purpose of the Study:

  • To demonstrate the first application of nonlinear regime two-line atomic fluorescence (NTLAF) thermometry.
  • To investigate the utility of NTLAF for studying the reaction zone in laminar non-premixed flames.
  • To explore indium atomization processes within the flame.

Main Methods:

  • Implementation of nonlinear regime two-line atomic fluorescence (NTLAF) thermometry.
  • Application of the technique to laminar non-premixed flames.
  • Analysis of indium fluorescence intensity and temperature profiles.

Main Results:

  • NTLAF thermometry successfully applied to laminar non-premixed flames.
  • Indium fluorescence was strongest at the flame-front, indicating temperatures over 1000 K.
  • Temperature measurements exhibited approximately 6% uncertainty and agreed well with laminar flame calculations.
  • The study provided insights into the indium atomization process.

Conclusions:

  • NTLAF thermometry is a viable technique for studying combustion reaction zones.
  • The method offers accurate temperature measurements in challenging flame environments.
  • Further research can explore the advantages and limitations of NTLAF for various combustion applications.