Lack of Aggregation of Molecules on Ice Nanoparticles

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• 作者：Andriy Pysanenko ; Alena Habartov谩 ; Pavla Svr膷kov谩 ; Jozef Lengyel ; Viktoriya Poterya ; Martina Roeselov谩 ; Juraj Fedor ; Michal F谩rn铆k
• 刊名：Journal of Physical Chemistry A
• 出版年：2015
• 出版时间：August 27, 2015
• 年：2015
• 卷：119
• 期：34
• 页码：8991-8999
• 全文大小：531K
• ISSN：1520-5215

文摘

Multiple molecules adsorbed on the surface of nanosized ice particles can either remain isolated or form aggregates, depending on their mobility. Such (non)aggregation may subsequently drive the outcome of chemical reactions that play an important role in atmospheric chemistry or astrochemistry. We present a molecular beam experiment in which the controlled number of guest molecules is deposited on the water and argon nanoparticles in a pickup chamber and their aggregation is studied mass spectrometrically. The studied molecules (HCl, CH₃Cl, CH₃CH₂CH₂Cl, C₆H₅Cl, CH₄, and C₆H₆) form large aggregates on argon nanoparticles. On the other hand, no aggregation is observed on ice nanoparticles. Molecular simulations confirm the experimental results; they reveal a high degree of aggregation on the argon nanoparticles and show that the molecules remain mostly isolated on the water ice surface. This finding will influence the efficiency of ice grain-mediated synthesis (e.g., in outer space) and is also important for the cluster science community because it shows some limitations of pickup experiments on water clusters.