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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...
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Updated: Dec 27, 2025

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Laser-Plasma Spectroscopy of Hydroxyl with Applications.

Christian G Parigger1, Christopher M Helstern1, Benjamin S Jordan2

  • 1Physics and Astronomy Department, University of Tennessee, University of Tennessee Space Institute, Center for Laser Applications, 411 B.H. Goethert Parkway, Tullahoma, TN 37388-9700, USA.

Molecules (Basel, Switzerland)
|February 27, 2020
PubMed
Summary

New hydroxyl (OH) ultraviolet spectra computations and line strength data are presented for laser-induced laboratory-air plasma. These findings aid in interpreting molecular emission spectra and temperature diagnostics in plasma and combustion analyses.

Keywords:
astrophysical spectroscopycombustion analysisdiatomic moleculeslaser spectroscopylaser-induced breakdown spectroscopymolecular excitation temperaturemolecular spectraoptical emission spectroscopyplasma diagnosticsplasma spectroscopy

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Area of Science:

  • Atomic and Molecular Spectroscopy
  • Plasma Physics
  • Laser-Induced Breakdown Spectroscopy (LIBS)

Background:

  • Accurate spectral data are crucial for analyzing molecular species in laboratory plasmas.
  • Hydroxyl (OH) radical is a key species in atmospheric and combustion plasmas.
  • Previous line strength data required further validation and broader application.

Purpose of the Study:

  • To present novel computations of hydroxyl (OH) ultraviolet spectra.
  • To introduce newly developed and validated OH spectral line strength data.
  • To demonstrate the application of these data in laser-induced plasma analysis.

Main Methods:

  • Utilized previously developed line strength data for OH ultraviolet spectra computations.
  • Performed new experiments using Q-switched laser pulses to study plasma evolution.
  • Incorporated centrifugal stretching of Franck-Condon factors and r-centroids for line strength determination.

Main Results:

  • Communicated new, well-tested line strength data for OH ultraviolet spectra.
  • Observed molecular recombination spectra in laboratory air plasma at microsecond delays.
  • Demonstrated the utility of OH signals arising from natural air humidity.

Conclusions:

  • The presented OH spectral data and computations are valuable for interpreting molecular emission spectra.
  • These data are well-suited for laser-induced fluorescence applications, including temperature diagnostics.
  • The findings support applications in laser-induced plasma and combustion analyses.