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

Artikel i vetenskaplig tidskrift
Författare Sofia M. Johansson
Xiangrui Kong
Erik S Thomson
Mattias Hallquist
Jan B. C. Pettersson
Publicerad i The journal of physical chemistry. A
Volym 121
Nummer/häfte 35
Sidor 6614–6619
ISSN 1520-5215
Publiceringsår 2017
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 6614–6619
Språk en
Länkar dx.doi.org/10.1021/acs.jpca.7b06263
www.ncbi.nlm.nih.gov/entrez/query.f...
Ämneskategorier Fysikalisk kemi

Sammanfattning

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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