Photodissociation of hydrogen halide molecules on free ice nanoparticles

Poterya, Viktoriya; Fárnı́k, Michal; Slavı́ček, Petr; Buck, U.; Kresin, Vladimir Z.

doi:10.1063/1.2709635

Cited by 39 publications

(76 citation statements)

References 38 publications

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“…The presence of molecules on ice nanoparticles was confirmed in some cases by our previous photodissociation studies 19,39,40 where features corresponding to nanoparticle−guest interactions (acidic dissociation) clearly dominate the spectra. Further evidence comes from the measured velocities shown in Figure 1.…”

Section: ■ Resultssupporting

confidence: 61%

Lack of Aggregation of Molecules on Ice Nanoparticles

et al. 2015

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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.

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Section: ■ Resultssupporting

confidence: 61%

Lack of Aggregation of Molecules on Ice Nanoparticles

et al. 2015

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“…Photodissociation studies of mixed water-hydrogen halide clusters with similar ion-pair structures demonstrated that the dissociating H atom exits from the clusters efficiently (Poterya et al, 2007;Ončák et al, 2011;Poterya et al, 2014). Therefore, it is plausible to assume that in the present case the H atom leaves the cluster after the recombination and carries away the excess energy without any need for further water evaporation from the cluster.…”

Section: Resultsmentioning

confidence: 99%

Electron-induced chemistry in microhydrated sulfuric acid clusters

2017

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Abstract. We investigate the mixed sulfuric acid-water clusters in a molecular beam experiment with electron attachment and negative ion mass spectrometry and complement the experiment by density functional theory (DFT) calculations. The microhydration of (H 2 SO 4 ) m (H 2 O) n clusters is controlled by the expansion conditions, and the electron attachment yields the main cluster ion series (H 2 SO 4 ) m (H 2 O) n HSO cluster ions point to an efficient caging of the H atom by the surrounding water molecules. The electron-energy dependencies exhibit an efficient electron attachment at low electron energies below 3 eV, and no resonances above this energy, for all the measured mass peaks. This shows that in the atmospheric chemistry only the low-energy electrons can be efficiently captured by the sulfuric acid-water clusters and converted into the negative ions. Possible atmospheric consequences of the acidic dissociation in the clusters and the electron attachment to the sulfuric acid-water aerosols are discussed.

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“…One of the fundamental questions of cluster chemistry is the cluster size at which the acidic dissociation occurs [6][7][8][9][10][11][12][13]. Typically 4-6 water molecules are reported to enable the acidic dissociation.…”

Section: Introductionmentioning

confidence: 99%