Articles | Volume 14, issue 8
Atmos. Meas. Tech., 14, 5319–5332, 2021
Atmos. Meas. Tech., 14, 5319–5332, 2021
Research article
 | Highlight paper
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 et al.

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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: ​​​​​​​, 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,, 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,, 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,, 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,, 2010. 
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.