Electron-induced chemistry in microhydrated sulfuric acid clusters
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F17%3A00482678" target="_blank" >RIV/61388955:_____/17:00482678 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.5194/acp-17-14171-2017" target="_blank" >http://dx.doi.org/10.5194/acp-17-14171-2017</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.5194/acp-17-14171-2017" target="_blank" >10.5194/acp-17-14171-2017</a>
Alternative languages
Result language
angličtina
Original language name
Electron-induced chemistry in microhydrated sulfuric acid clusters
Original language description
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 (H2SO4)(m)(H2O)(n) clusters is controlled by the expansion conditions, and the electron attachment yields the main cluster ion series (H2SO4)(m)(H2O)(n)HSO4- and (H2O)(n)H2SO4-. The mass spectra provide an experimental evidence for the onset of the ionic dissociation of sulfuric acid and ion-pair (HSO4-center dot center dot center dot H3O+) formation in the neutral H2SO4(H2O)(n) clusters with n >= 5 water molecules, in excellent agreement with the theoretical predictions. In the clusters with two sulfuric acid molecules (H2SO4)(2)(H2O)(n) this process starts as early as n >= 2 water molecules. The (H2SO4)(m) (H2O)(n)HSO4 clusters are formed after the dissociative electron attachment to the clusters containing the (HSO4-center dot center dot center dot H3O+) ion-pair structure, which leads to the electron recombination with the H3O+ moiety generating H2O molecule and the H-atom dissociation from the cluster. The (H2O)(n) H2SO4- 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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
<a href="/en/project/GA17-04068S" target="_blank" >GA17-04068S: Molecular Clusters as Unique Nano-reactors: Controlling Chemistry with Photons and Electrons</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Atmospheric Chemistry and Physics
ISSN
1680-7324
e-ISSN
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Volume of the periodical
17
Issue of the periodical within the volume
22
Country of publishing house
DE - GERMANY
Number of pages
10
Pages from-to
14171-14180
UT code for WoS article
000416439400001
EID of the result in the Scopus database
2-s2.0-85035801941