Lack of Aggregation of Molecules on Ice Nanoparticles

0446583 - ÚFCH JH 2016 RIV US eng J - Journal Article
Pysanenko, Andriy - Habartová, Alena - Svrčková, Pavla - Lengyel, Jozef - Poterya, Viktoriya - Roeselová, Martina - Fedor, Juraj - Fárník, Michal
Lack of Aggregation of Molecules on Ice Nanoparticles.
Journal of Physical Chemistry A. Roč. 119, č. 34 (2015), s. 8991-8999. ISSN 1089-5639. E-ISSN 1520-5215
R&D Projects: GA ČR(CZ) GA15-12386S; GA ČR GA13-06181S
Institutional support: RVO:61388955 ; RVO:61388963
Keywords : LARGE WATER CLUSTERS * INFRARED-SPECTROSCOPY * DYNAMICS SIMULATIONS
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.883, year: 2015

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.
Permanent Link: http://hdl.handle.net/11104/0248563