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Laser absorption spectroscopy measurements of neutral N$$_2$$O in a radio frequency plasma

Landon D. Bevier, Justin M. Little
August 14, 2026
Published Date

Research Abstract & Technology Focus

Infrared laser absorption spectroscopy is tested as a diagnostic for measuring neutral nitrous oxide (N $$_2$$ O) concentrations in a radio frequency (RF) plasma source. Using a quantum cascade laser tuned to an isolated rovibrational mode of N $$_2$$ O, the density of neutral molecules is measured using a Gaussian fit of the absorbance spectrum. The diagnostic is tested with both neutral flows and in the presence of an RF plasma. The absorption spectrometer was found to accurately measure neutral gas density compared to pressure gauge readings. Furthermore, the Gaussian fit method was robust to RF noise, maintaining a signal-to-noise ratio above 7 even while in the presence of plasma. The diagnostic was able to measure concentrations of N $$_2$$ O in two distinct operating modes of the RF plasma, demonstrating that the diagnostic is sensitive to neutral densities above $$5.7 \times 10^{10}$$ cm $$^{-3}$$ .
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This literature focuses on: Infrared laser absorption spectroscopy is tested as a diagnostic for measuring neutral nitrous oxide (N $$_2$$ O) concentrations in a radio frequency (RF) plasma source. Using a quantum cascade laser tuned to an isolated rovibrational mode of N $$...

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What other academic literature is closely related to 'Laser absorption spectroscopy measurements of neutral N$$_2$$O in a radio frequency plasma'?

Yes, highly correlated activity was mapped. An entry titled 'Enhancement of Electromagnetic Wave Attenuation through Polarization Loss Induced by Hybridization of Rare‐Earth 4f and Mo‐4d Orbitals in Liquid Plasma' discusses this: AbstractThe incorporation of large‐sized rare earth (RE) elements with high coordination characteristics into transition metal dichalcogenide (TMD)...

Are there commercial applications of 'Laser absorption spectroscopy measurements of neutral N$$_2$$O in a radio frequency plasma' in market news publications?

Yes, highly correlated activity was mapped. An entry titled 'Electro-optic comb-empowered measurement of the dynamic frequency of a laser' discusses this: Using integrated lithium niobate electro-optic frequency combs with slightly different repetition rates, accurate tracking of the frequency variati...

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