Ion Mobility-Mass Spectrometry of Iodine Pentoxide-Iodic Acid Hybrid Cluster Anions in Dry and Humidified Atmospheres

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Ahonen , L , Li , C , Kubecka , J , Iyer , S , Vehkamäki , H , Petäjä , T , Kulmala , M & Hogan , C J 2019 , ' Ion Mobility-Mass Spectrometry of Iodine Pentoxide-Iodic Acid Hybrid Cluster Anions in Dry and Humidified Atmospheres ' , Journal of Physical Chemistry Letters , vol. 10 , no. 8 , pp. 1935-1941 . https://doi.org/10.1021/acs.jpclett.9b00453

Title: Ion Mobility-Mass Spectrometry of Iodine Pentoxide-Iodic Acid Hybrid Cluster Anions in Dry and Humidified Atmospheres
Author: Ahonen, Lauri; Li, Chenxi; Kubecka, Jakub; Iyer, Siddharth; Vehkamäki, Hanna; Petäjä, Tuukka; Kulmala, Markku; Hogan, Christopher J.
Contributor: University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
University of Helsinki, Department of Chemistry
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2019-04-18
Language: eng
Number of pages: 13
Belongs to series: Journal of Physical Chemistry Letters
ISSN: 1948-7185
URI: http://hdl.handle.net/10138/303437
Abstract: Nanometer-scale clusters form from vapor-phase precursors and can subsequently grow into nanoparticles during atmospheric nucleation events. A particularly interesting set of clusters relevant to nucleation is hybrid iodine pentoxide-iodic acid clusters of the form (I2O5)(x)(HIO3)(y) as these clusters have been observed in coastal region nucleation events in anomalously high concentrations. To better understand their properties, we utilized ion mobility-mass spectrometry to probe the structures of cluster anions of the form (I2O5)(x)(HIO3)(y)(IO alpha)(-) (x = 0-7,y = 0-1, alpha = 1-3), similar to those observed in coastal nucleation events. We show that (I2O5)(x)(HIO3)(y)(IO alpha)(-) clusters are relatively stable against dissociation during mass spectrometric measurement, as compared to other clusters observed in nucleation events over continental sites, and that at atmospherically relevant relative humidity levels (65% and less) clusters can become sufficiently hydrated to facilitate complete conversion of iodine pentoxide to iodic acid but that water sorption beyond this level is limited, indicating that the clusters do not persist as nanometer-scale droplets in the ambient.
Subject: PARTICLE FORMATION
SULFURIC-ACID
NUCLEATION
COASTAL
NANOPARTICLES
SCATTERING
HYDRATION
EXTENTS
GROWTH
RATES
114 Physical sciences
116 Chemical sciences
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