Encyclopedia entry
Continuous wave CEMOR for measurement of HO2
US Combustion Meeting, 10, pp.1160-1167
01 Jan 2017
Abstract
Current combustion chemistry models are lacking detail in the low and intermediate temperature region where hydroxyl (OH), hydroperoxy (HO2), and alkylperoxy (RO2) radicals control the oxidation chemistry. Measurement of these radicals is difficult in combustion systems because of spectral overlap with stable products of combustion, such as CO2 and H2O. Therefore, there is a need for sensitive and selective diagnostics which can quantitatively measure these weakly absorbing small peroxy radicals in combustion systems. The authors have approached this need by applying a sensitive and selective laser diagnostic technique called Cavity Enhanced Magneto-Optic Rotation (CEMOR) for quantitative measurement of paramagnetic species, specifically HO2 radicals. CEMOR combines the sensitivity of cavity ringdown spectroscopy (CRDS) and the selectivity of magneto-optic rotation (MOR) spectroscopy. This work presents a novel design of CEMOR with a continuous wave laser source for measurement of HO2. The narrower bandwidth of continuous wave lasers offers increased spectroscopic resolution over the pulsed Nd:YAG/OPO laser used for previous CEMOR development. Continuous wave cavity ringdown spectroscopy (cw-CRDS) is integrated with MOR in order to make high-resolution scans of the HO2 spectra. The present method can easily be adapted for alkyl peroxy (RO2) radicals. Demonstration of the effect of magnetic field strength on the MOR signal is presented. Remaining challenges are discussed.
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Details
- Title
- Continuous wave CEMOR for measurement of HO2
- Creators
- Michael StichterNicholas CernanskyDavid Miller
- Publication Details
- US Combustion Meeting, 10, pp.1160-1167
- Conference
- US Combustion Meeting, 10, 10th
- Publisher
- WTI-Frankfurt-digital GmbH
- Number of pages
- 1
- Resource Type
- Encyclopedia entry
- Language
- English
- Academic Unit
- [Retired Faculty]
- Identifiers
- 991019173801504721