Articles | Volume 14, issue 8
https://doi.org/10.5194/amt-14-5319-2021
https://doi.org/10.5194/amt-14-5319-2021
Research article
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03 Aug 2021
Research article | Highlight paper |  | 03 Aug 2021

Iodide CIMS and mz 62: the detection of HNO3 as NO3 in the presence of PAN, peroxyacetic acid and ozone

Raphael Dörich, Philipp Eger, Jos Lelieveld, and John N. Crowley

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Cited articles

Ammann, M., Cox, R. A., Crowley, J. N., Herrmann, H., Jenkin, M. E., McNeill, V. F., Mellouki, A., Rossi, M. J., Troe, J., and Wallington, T. J.: Atmospheric Chemical Kinetic Data Evaluation, available at: ​​​​​​​http://iupac.pole-ether.fr/index.html, last access: 20 July 2021. 
Atkinson, R., Baulch, D. L., Cox, R. A., Crowley, J. N., Hampson, R. F., Hynes, R. G., Jenkin, M. E., Rossi, M. J., and Troe, J.: Evaluated kinetic and photochemical data for atmospheric chemistry: Volume I – gas phase reactions of Ox, HOx, NOx and SOx species, Atmos. Chem. Phys., 4, 1461–1738, https://doi.org/10.5194/acp-4-1461-2004, 2004. 
Bhujel, M., Marshall, D. L., Maccarone, A. T., McKinnon, B. I., Trevitt, A. J., da Silva, G., Blanksby, S. J., and Poad, B. L. J.: Gas phase reactions of iodide and bromide anions with ozone: evidence for stepwise and reversible reactions, Phys. Chem. Chem. Phys., 22, 9982–9989, https://doi.org/10.1039/d0cp01498b, 2020. 
Chang, W. L., Bhave, P. V., Brown, S. S., Riemer, N., Stutz, J., and Dabdub, D.: Heterogeneous atmosperic chemistry, ambient measurements and model calculatuons of N2O5: A review, Aerosol Sci. Tech., 45, 655–685, https://doi.org/10.1080/02786826.2010.551672, 2011. 
Crowley, J. N., Ammann, M., Cox, R. A., Hynes, R. G., Jenkin, M. E., Mellouki, A., Rossi, M. J., Troe, J., and Wallington, T. J.: Evaluated kinetic and photochemical data for atmospheric chemistry: Volume V – heterogeneous reactions on solid substrates, Atmos. Chem. Phys., 10, 9059–9223, https://doi.org/10.5194/acp-10-9059-2010, 2010. 
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Short summary
We demonstrate in laboratory experiments that the formation of IOx anions (formed in reactions of I with O3) or acetate anions (formed e.g. by the reaction of I with peracetic acid) results in unexpected sensitivity of an iodide chemical ionisation mass spectrometer (I-CIMS) to HNO3 at a mass-to-charge ratio of 62. This helps explain observations of apparent high daytime levels of N2O5. Airborne measurements using I-CIMS confirm these conclusions.