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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...
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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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Conjugation, a key component of phase II biotransformation reactions, is a vital process in drug detoxification. It involves transferring endogenous substances like glucuronic acid, sulfate, and glycine to drugs or their metabolites formed in phase I reactions. These conjugation reactions, often catalyzed by specific enzymes, transform potentially harmful metabolites into inactive, water-soluble forms easily excreted in urine or bile. By enhancing polarity and eliminating pharmacological...
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Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes
10:04

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Published on: May 26, 2014

Phase conjugation in a flame.

J Pender, L Hesselink

    Optics Letters
    |September 3, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers observed degenerate four-wave mixing in a sodium-seeded flame for the first time. This technique can measure species concentration, offering a new diagnostic tool for combustion analysis.

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    Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
    07:24

    Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

    Published on: February 19, 2018

    Area of Science:

    • Physical Chemistry
    • Combustion Science
    • Nonlinear Optics

    Background:

    • Degenerate four-wave mixing (DFWM) is a nonlinear optical technique.
    • Flame diagnostics are crucial for understanding combustion processes.
    • Measuring species concentration in flames is challenging.

    Purpose of the Study:

    • To report the first observation of DFWM in a sodium-seeded flame.
    • To experimentally verify the theoretical dependence of phase-conjugate output on sodium concentration.
    • To demonstrate DFWM as a potential diagnostic tool for species concentration measurement.

    Main Methods:

    • Utilized a sodium-seeded flame as the nonlinear medium.
    • Employed degenerate four-wave mixing experimental setup.
    • Measured phase-conjugate output intensity.
    • Varied sodium concentration to study its effect.

    Main Results:

    • Successfully observed DFWM in a sodium-seeded flame.
    • Experimental results confirmed the theoretical relationship between phase-conjugate output and sodium concentration.
    • Phase-conjugate signal intensity was found to be dependent on sodium concentration.

    Conclusions:

    • DFWM is feasible in sodium-seeded flames.
    • The technique shows promise for quantitative species concentration measurements.
    • This method can be applied to both combusting and noncombusting media.