@article{
 title = {Effect of dimethylamine on the gas phase sulfuric acid concentration measured by chemical ionization mass spectrometry},
 type = {article},
 year = {2016},
 keywords = {10.1002/2014JD022963 and sea spray aerosol,aerosol-cloud interactions,cloud condensation nuclei,marine aerosol,stratocumulus clouds,supersaturations},
 pages = {3036-3049},
 volume = {121},
 websites = {http://onlinelibrary.wiley.com/doi/10.1002/2015JD023868/full},
 id = {cbe03ae4-e8a4-3010-8abd-da57889bfe7e},
 created = {2017-04-12T23:44:41.073Z},
 file_attached = {false},
 profile_id = {2e2b0bf1-6573-3fd8-8628-55d1dc39fe31},
 last_modified = {2020-11-02T20:28:33.956Z},
 read = {false},
 starred = {false},
 authored = {true},
 confirmed = {true},
 hidden = {false},
 citation_key = {Rondo2016},
 source_type = {article},
 folder_uuids = {e9db4589-c14d-471c-8b7a-bb4b8e16be27},
 private_publication = {false},
 abstract = {Sulfuric acid is widely recognized as a very important substance driving atmospheric aerosol nucleation. Based on quantum chemical calculations it has been suggested that the quantitative detection of gas phase sulfuric acid (H2SO4) by use of Chemical Ionization Mass Spectrometry (CIMS) could be biased in the presence of gas phase amines such as dimethylamine (DMA). An experiment (CLOUD7 campaign) was set up at the CLOUD (Cosmics Leaving OUtdoor Droplets) chamber to investigate the quantitative detection of H2SO4 in the presence of dimethylamine by CIMS at atmospherically relevant concentrations. For the first time in the CLOUD experiment, the monomer sulfuric acid concentration was measured by a CIMS and by two CI-APi-TOF (Chemical Ionization-Atmospheric Pressure interface-Time Of Flight) mass spectrometers. In addition, neutral sulfuric acid clusters were measured with the CI-APi-TOFs. The CLOUD7 measurements show that in the presence of dimethylamine (<5 to 70 pptv) the sulfuric acid monomer measured by the CIMS represents only a fraction of the total H2SO4, contained in the monomer and the clusters that is available for particle growth. Although it was found that the addition of dimethylamine dramatically changes the H2SO4 cluster distribution compared to binary (H2SO4-H2O) conditions, the CIMS detection efficiency does not seem to depend substantially on whether an individual H2SO4 monomer is clustered with a DMA molecule. The experimental observations are supported by numerical simulations based on A Self-contained Atmospheric chemistry coDe coupled with a molecular process model (Sulfuric Acid Water NUCleation) operated in the kinetic limit.},
 bibtype = {article},
 author = {Rondo, L. and Ehrhart, S. and Kürten, A. and Adamov, A. and Bianchi, F. and Breitenlechner, M. and Duplissy, J. and Franchin, A. and Dommen, J. and Donahue, N. M. and Dunne, E. M. and Flagan, R. C. and Hakala, J. and Hansel, A. and Keskinen, H. and Kim, J. and Jokinen, T. and Lehtipalo, K. and Leiminger, M. and Praplan, A. and Riccobono, F. and Rissanen, M. P. and Sarnela, N. and Schobesberger, S. and Simon, M. and Sipilä, M. and Smith, J. N. and Tomé, A. and Tröstl, J. and Tsagkogeorgas, G. and Vaattovaara, P. and Winkler, P. M. and Williamson, C. and Wimmer, D. and Baltensperger, U. and Kirkby, J. and Kulmala, M. and Petäjä, T. and Worsnop, D. R. and Curtius, J.},
 doi = {10.1002/2015JD023868},
 journal = {Journal of Geophysical Research},
 number = {6}
}

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Based on quantum chemical calculations it has been suggested that the quantitative detection of gas phase sulfuric acid (H2SO4) by use of Chemical Ionization Mass Spectrometry (CIMS) could be biased in the presence of gas phase amines such as dimethylamine (DMA). An experiment (CLOUD7 campaign) was set up at the CLOUD (Cosmics Leaving OUtdoor Droplets) chamber to investigate the quantitative detection of H2SO4 in the presence of dimethylamine by CIMS at atmospherically relevant concentrations. For the first time in the CLOUD experiment, the monomer sulfuric acid concentration was measured by a CIMS and by two CI-APi-TOF (Chemical Ionization-Atmospheric Pressure interface-Time Of Flight) mass spectrometers. In addition, neutral sulfuric acid clusters were measured with the CI-APi-TOFs. The CLOUD7 measurements show that in the presence of dimethylamine (<5 to 70 pptv) the sulfuric acid monomer measured by the CIMS represents only a fraction of the total H2SO4, contained in the monomer and the clusters that is available for particle growth. Although it was found that the addition of dimethylamine dramatically changes the H2SO4 cluster distribution compared to binary (H2SO4-H2O) conditions, the CIMS detection efficiency does not seem to depend substantially on whether an individual H2SO4 monomer is clustered with a DMA molecule. The experimental observations are supported by numerical simulations based on A Self-contained Atmospheric chemistry coDe coupled with a molecular process model (Sulfuric Acid Water NUCleation) operated in the kinetic limit.","bibtype":"article","author":"Rondo, L. and Ehrhart, S. and Kürten, A. and Adamov, A. and Bianchi, F. and Breitenlechner, M. and Duplissy, J. and Franchin, A. and Dommen, J. and Donahue, N. M. and Dunne, E. 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