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Electrospray Mass Spectrometric Detection of Products and Short-Lived Intermediates in Aqueous Aerosol Microdroplets Exposed to a Reactive Gas

Enami, S. and Vecitis, C. D. and Cheng, J. and Hoffmann, M. R. and Colussi, A. J. (2007) Electrospray Mass Spectrometric Detection of Products and Short-Lived Intermediates in Aqueous Aerosol Microdroplets Exposed to a Reactive Gas. Journal of Physical Chemistry A, 111 (50). pp. 13032-13037. ISSN 1089-5639. https://resolver.caltech.edu/CaltechAUTHORS:20150623-154751968

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Abstract

The intermediates ISO_3^- (m/z = 207) and IS2O3- (m/z = 239) generated in aqueous (NaI/Na_2S2O_3) microdroplets traversing dilute O_3 gas plumes are detected via online electrospray mass spectrometry within ∼1 ms, and their stabilities gauged by collisionally induced dissociation. The simultaneous detection of anionic reactants and the S_2O_6^(2-), HSO_4^-, IO_3^-, and I_3^- products as a function of experimental conditions provides evidence of genuinely interfacial reaction kinetics. Although O_3(aq) reacts about 3 times faster with I- than with S_2O_3^(2-) in bulk solution, only S_2O_3^(2-) is significantly depleted in the interfacial layers of [I^-]/[S_2O_3^(2-)] = 10 microdroplets below [O_3(g)] ∼ 50 ppm.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/jp075505rDOIArticle
http://pubs.acs.org/doi/abs/10.1021/jp075505rPublisherArticle
http://pubs.acs.org/doi/suppl/10.1021/jp075505rPublisherSupporting Information
ORCID:
AuthorORCID
Enami, S.0000-0002-2790-7361
Hoffmann, M. R.0000-0001-6495-1946
Colussi, A. J.0000-0002-3400-4101
Additional Information:© 2007 American Chemical Society. Received: July 13, 2007; In Final Form: September 26, 2007. This work was financially supported by the National Science Foundation grant ATM-0534990. We thank Nathan F. Dalleska for valuable advice on ESMS, and Mike Vondrus for assistance in setting up the ozone injector. S.E. is grateful to Prof. M. Kawasaki (Kyoto University), Prof. Y. Matsumi (Nagoya University), and the JSPS Research Fellowship for Young Scientists.
Funders:
Funding AgencyGrant Number
NSFATM-0534990
Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
Issue or Number:50
Record Number:CaltechAUTHORS:20150623-154751968
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150623-154751968
Official Citation:Electrospray Mass Spectrometric Detection of Products and Short-Lived Intermediates in Aqueous Aerosol Microdroplets Exposed to a Reactive Gas S. Enami, C. D. Vecitis, J. Cheng, M. R. Hoffmann, and A. J. Colussi The Journal of Physical Chemistry A 2007 111 (50), 13032-13037 DOI: 10.1021/jp075505r
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58464
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:29 Jul 2015 20:52
Last Modified:03 Mar 2020 13:01

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