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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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Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
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Atomic Absorption Spectroscopy: Atomization Methods

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Atmospheric Gas Absorption at DF Laser Wavelengths.

D J Spencer, G C Denault, H H Takimoto

    Applied Optics
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    This study measured the absorption of DF laser wavelengths by methane, nitrous oxide, carbon dioxide, and water vapor. Results show significant transmission for several wavelengths across different atmospheric paths.

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    Published on: February 14, 2014

    Area of Science:

    • Atmospheric spectroscopy
    • Laser-based gas analysis

    Background:

    • Accurate atmospheric gas absorption data is crucial for climate modeling and remote sensing.
    • Previous models may not fully capture absorption across specific DF laser wavelengths.

    Purpose of the Study:

    • To measure and calculate the absorption of specific DF laser wavelengths by key atmospheric gases.
    • To evaluate atmospheric transmission for vertical and horizontal paths.
    • To compare experimental data with existing theoretical predictions.

    Main Methods:

    • Measured absorption spectra for CH(4), N(2)O, CO(2), and HDO vapor using 24 DF laser wavelengths.
    • Calculated total absorption for individual gases and continua (N(2), H(2)O).
    • Modeled transmission for a vertical (2.93 cm precipitable water) and a horizontal (11.2 cm precipitable water) atmospheric path.

    Main Results:

    • Transmission exceeded 90% for 12 lines in the vertical path.
    • Transmission exceeded 65% for 13 lines in the horizontal path.
    • Measured absorption coefficients showed good agreement (within a factor of ~2) with McClatchey and Selby's calculated values for most lines.

    Conclusions:

    • The study provides valuable experimental data for DF laser absorption by atmospheric gases.
    • Experimental results validate existing models for many wavelengths, with minor discrepancies noted.
    • Findings support the use of DF lasers for atmospheric monitoring and analysis.