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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
09:40

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

Published on: February 14, 2014

Absorption line parameter measurements using laser spectroscopy.

Z Kucerovsky, E Brannen, D G Rumbold

    Applied Optics
    |February 4, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new analytical method precisely determines absorption line locations and pressure broadening coefficients using laser spectroscopy. This technique accurately quantifies gas properties for applications in atmospheric science and spectroscopy.

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    Area of Science:

    • Spectroscopy
    • Atmospheric Chemistry
    • Physical Chemistry

    Background:

    • Accurate determination of absorption line parameters is crucial for gas analysis.
    • Existing methods for pressure broadening coefficients can be complex and time-consuming.
    • Laser-based techniques offer potential for high-precision measurements.

    Purpose of the Study:

    • To develop and validate a novel analytical method for precise absorption line location and pressure broadening coefficient determination.
    • To apply the method to specific gas absorption lines (vinyl chloride and methane) and compare results with existing profiles.
    • To provide a robust computational approach for analyzing spectral data.

    Main Methods:

    • Utilizing a single-line laser to probe absorption lines and measuring pressure-dependent transmittance.
    • Employing a least-squares fit to a family of Lorentz curves with a computer search for optimal parameter estimation.
    • Comparing results with graphical fits to Voigt profiles for validation.

    Main Results:

    • The method successfully determined absorption line locations and pressure broadening coefficients for vinyl chloride and methane.
    • Self-broadening coefficients were obtained with associated errors for both gases.
    • Precise separation between a helium-neon laser line and a methane absorption line was calculated.

    Conclusions:

    • The developed analytical method provides accurate and reliable determination of absorption line characteristics.
    • The technique is effective for quantifying pressure broadening coefficients, comparable to more complex models.
    • This computational approach enhances spectral analysis capabilities for various gases.