Articles | Volume 9, issue 8
Research article
19 Aug 2016
Research article |  | 19 Aug 2016

A new technique for the direct detection of HO2 radicals using bromide chemical ionization mass spectrometry (Br-CIMS): initial characterization

Javier Sanchez, David J. Tanner, Dexian Chen, L. Gregory Huey, and Nga L. Ng

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Cited articles

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Brophy, P. and Farmer, D. K.: A switchable reagent ion high resolution time-of-flight chemical ionization mass spectrometer for real-time measurement of gas phase oxidized species: characterization from the 2013 southern oxidant and aerosol study, Atmos. Meas. Tech., 8, 2945–2959,, 2015.
Brune, W. H., Stevens, P. S., and Mather, J. H.: Measuring OH and HO2 in the troposphere by laser-induced fluorescence at low-pressure, J. Atmos. Sci., 52, 3328–3336,<3328:moahit>;2, 1995.
Short summary
HO2 radicals play an important role in tropospheric chemistry. Here we propose a new direct method for measuring HO2 radicals in the atmosphere using bromide anion chemical ionization mass spectrometry. Ambient measurements in Atlanta are presented. Instrument performance parameters: sensitivity, lower detection limit, and time resolution are discussed. We demonstrate that the technique provides excellent selectivity and is suitable for in situ ground-based HO2 measurements.