Articles | Volume 9, issue 8
https://doi.org/10.5194/amt-9-3851-2016
https://doi.org/10.5194/amt-9-3851-2016
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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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.