University of Illinois Urbana-Champaign

Absolute number density measurements of hydroperoxyl radical in a nanosecond pulse discharge using cavity ring-down spectroscopy

Frederickson, Kraig

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1138801.pptx
3103.pdf

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https://hdl.handle.net/2142/100527

Description

Title
Absolute number density measurements of hydroperoxyl radical in a nanosecond pulse discharge using cavity ring-down spectroscopy
Author(s)
Frederickson, Kraig
Contributor(s)
  • Adamovich, Igor V.
  • Miller, Terry A.
Issue Date
2018-06-21
Keyword(s)
Spectroscopy as an analytical tool
Date of Ingest
  • 2018-08-17T16:09:05Z
  • 2018-12-12T22:38:53Z
Abstract
A recently implemented cavity ring-down spectrometer has been used to perform absolute number density measurements of hydroperoxyl radical (HO2) generated in a repetitive nanosecond-duration, pulse discharge sustained in a mixture of H2/O2/Ar. The probe source for the spectrometer is a custom-built, injection-seeded, optical parametric oscillator emitting an idler beam in the 1500 nm region accessing the first overtone (2ν1) of the O-H stretch. Water vapor was used as a standard species to characterize the spectrometer and provide estimates of the spectral linewidth, sensitivity, and noise level. A specially constructed ring-down cell, with the central portion consisting of rectangular quartz channel tubing and a pair of copper plate electrodes, was used to produce a repetitively pulsed discharge in a H2/O2/Ar mixture. Narrow bandwidth cavity ring down spectra are acquired of a hydroperoxyl absorption feature composed of numerous closely spaced ro-vibrational lines centered at 6638.20 cm−1 and number density is determined from the resulting spectral line. This is believed to be the first detection and quantitative measurement of hydroperoxyl radical produced in a nanosecond pulse discharge. The measured number density is compared to the value predicted by the kinetic model of a nanosecond pulse discharge in a reacting H2/O2/Ar mixture.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/100527
DOI
10.15278/isms.2018.RH02
Copyright and License Information
Copyright 2018 Kraig Frederickson

Owning Collections

Abstracts & Presentations - 2018 International Symposium on Molecular Spectroscopy PRIMARY