Direct in situ quantification of HO2 from a flow reactor

Brian Brumfield, Wenting Sun, Yiguang Ju, Gerard Wysocki

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53 Scopus citations


The first direct in situ measurements of hydroperoxyl radical (HO 2) at atmospheric pressure from the exit of a laminar flow reactor have been carried out using mid-infrared Faraday rotation spectroscopy. HO 2 was generated by oxidation of dimethyl ether, a potential renewable biofuel with a simple molecular structure but rich low-temperature oxidation chemistry. On the basis of the results of nonlinear fitting of the experimental data to a theoretical spectroscopic model, the technique offers an estimated sensitivity of <1 ppmv over a reactor exit temperature range of 398-673 K. Accurate in situ measurement of this species will aid in quantitative modeling of low-temperature and high-pressure combustion kinetics.

Original languageEnglish (US)
Pages (from-to)872-876
Number of pages5
JournalJournal of Physical Chemistry Letters
Issue number6
StatePublished - Mar 21 2013

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Physical and Theoretical Chemistry


  • DME oxidation
  • Faraday rotation spectroscopy
  • hydroperoxyl radical


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