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The Dynamics and Kinetics of Water Interactions with a Condensed Nopinone Surface.

Journal article
Authors Sofia M. Johansson
Xiangrui Kong
Erik S Thomson
Mattias Hallquist
Jan B. C. Pettersson
Published in The journal of physical chemistry. A
Volume 121
Issue 35
Pages 6614–6619
ISSN 1520-5215
Publication year 2017
Published at Department of Chemistry and Molecular Biology
Pages 6614–6619
Language en
Subject categories Physical Chemistry


Water and organic molecules are omnipresent in the environment, and their interactions are of central importance in many Earth system processes. Here we investigate molecular-level interactions between water and a nopinone surface using an environmental molecular beam (EMB) technique. Nopinone is a major reaction product formed during oxidation of β-pinene, a prominent compound emitted by coniferous trees, which has been found in both the gas and particle phases of atmospheric aerosol. The EMB method enables detailed studies of the dynamics and kinetics of D2O molecules interacting with a solid nopinone surface at 202 K. Hyperthermal collisions between water and nopinone result in efficient trapping of water molecules, with a small fraction that scatter inelastically after losing 60-80% of their incident kinetic energy. While the majority of the trapped molecules rapidly desorb with a time constant τ less than 10 μs, a substantial fraction (0.32 ± 0.09) form strong bonds with the nopinone surface and remain in the condensed phase for milliseconds or longer. The interactions between water and nopinone are compared to results for recently studied water-alcohol and water-acetic acid systems, which display similar collision dynamics but differ with respect to the kinetics of accommodated water. The results contribute to an emerging surface science-based view and molecular-level description of organic aerosols in the atmosphere.

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