Determination of the Collision Rate Coefficient between Charged Iodic Acid Clusters and Iodic Acid using the Appearance Time Method
Creators: name: He, Xu-Cheng
name: Iyer, Siddharth
name: Sipilä, Mikko
name: Ylisirniö, Arttu
name: Peltola, Maija
name: Kontkanen, Jenni
name: Baalbaki, Rima
name: Simon, Mario
name: Kürten, Andreas
name: Tham, Yee Jun
name: Pesonen, Janne
name: Ahonen, Lauri R.
name: Amanatidis, Stavros
name: Amorim, Antonio
name: Baccarini, Andrea
name: Beck, Lisa
name: Bianchi, Federico
name: Brilke, Sophia
name: Chen, Dexian
name: Chiu, Randall
name: Curtius, Joachim
name: Dada, Lubna
name: Dias, Antonio
name: Dommen, Josef
name: Donahue, Neil M.
name: Duplissy, Jonathan
name: Haddad, Imad El
name: Finkenzeller, Henning
name: Fischer, Lukas
name: Heinritzi, Martin
name: Hofbauer, Victoria
name: Kangasluoma, Juha
name: Kim, Changhyuk
name: Koenig, Theodore K.
name: Kubečka, Jakub
name: Kvashnin, Aleksandr
name: Lamkaddam, Houssni
name: Lee, Chuan Ping
name: Leiminger, Markus
name: Li, Zijun
name: Makhmutov, Vladimir
name: Xiao, Mao
name: Marten, Ruby
name: Nie, Wei
name: Onnela, Antti
name: Partoll, Eva
name: Petäjä, Tuukka
name: Salo, Vili-Taneli
name: Schuchmann, Simone
name: Steiner, Gerhard
name: Stolzenburg, Dominik
name: Stozhkov, Yuri
name: Tauber, Christian
name: Tomé, António
name: Väisänen, Olli
name: Vazquez-Pufleau, Miguel
name: Volkamer, Rainer
name: Wagner, Andrea C.
name: Wang, Mingyi
name: Wang, Yonghong
name: Wimmer, Daniela
name: Winkler, Paul M.
name: Worsnop, Douglas R.
name: Wu, Yusheng
name: Yan, Chao
name: Ye, Qing
name: Lehtinen, Kari
name: Nieminen, Tuomo
name: Manninen, Hanna E.
name: Rissanen, Matti
name: Schobesberger, Siegfried
name: Lehtipalo, Katrianne
name: Baltensperger, Urs
name: Hansel, Armin
name: Kerminen, Veli-Matti
name: Flagan, Richard C.
name: Kirkby, Jasper
name: Kurtén, Theo
name: Kulmala, Markku
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biophysics
subject: Biochemistry
subject: Physical Sciences not elsewhere classified
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Astronomical and Space Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine

description: Ions enhance the formation rate of atmospheric aerosol particles, which play an important role in Earth’s radiative balance. Ion-induced nucleation involves the stepwise accretion of neutral monomers onto a molecular cluster containing an ion, which helps to stabilize the cluster against evaporation. Although theoretical frameworks exist to calculate the collision rate coefficients between neutral molecules and ions, they need to be experimentally confirmed, ideally under atmospherically relevant conditions of around 1000 ion pairs cm<sup>−3</sup>. Here, in experiments performed under atmospheric conditions in the CERN CLOUD chamber, we have measured the collision rate coefficients between neutral iodic acid (HIO<sub>3</sub>) monomers and charged iodic acid molecular clusters containing up to 11 iodine atoms. Three methods were analytically derived to calculate ion-polar molecule collision rate coefficients. After evaluation with a kinetic model, the 50% appearance time method is found to be the most robust. The measured collision rate coefficient, averaged over all iodine clusters, is (2.4 ± 0.8)×10<sup>−9</sup> cm<sup>3</sup> s<sup>−1</sup>, which is close to the expectation from the surface charge capture theory.