Ionization of Ammonia Nanoices with Adsorbed Methanol Molecules
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F18%3A43916698" target="_blank" >RIV/60461373:22340/18:43916698 - isvavai.cz</a>
Alternative codes found
RIV/61388955:_____/18:00495950
Result on the web
<a href="https://pubs.acs.org/doi/10.1021/acs.jpca.8b07974" target="_blank" >https://pubs.acs.org/doi/10.1021/acs.jpca.8b07974</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.jpca.8b07974" target="_blank" >10.1021/acs.jpca.8b07974</a>
Alternative languages
Result language
angličtina
Original language name
Ionization of Ammonia Nanoices with Adsorbed Methanol Molecules
Original language description
Large ammonia clusters represent a model system of ices that are omnipresent throughout the space. The interaction of ammonia ices with other hydrogen-boding molecules such as methanol or water and their behavior upon an ionization are thus relevant in the astrochemical context. In this study, ammonia clusters (NH3)(N) with the mean size (N) over bar approximate to 230 were prepared in molecular beams and passed through a pickup cell in which methanol molecules were adsorbed. At the highest exploited pickup pressures, the average composition of (NH3)(N)(CH3OH)(M) clusters was estimated to be N:M approximate to 210:10. On the other hand, the electron ionization of these clusters yielded about 75% of methanol-containing fragments (NH3)(n)(CH3OH)(m)H+ compared to 25% contribution of pure ammonia (NH3)(n)H+ ions. On the basis of this substantial disproportion, we propose the following ionization mechanism: The prevailing ammonia is ionized in most cases, resulting in NH4+ core solvated most likely with four ammonia molecules, yielding the wellknown "magic number" structure (NH3)(4)NH4+. The methanol molecules exhibit a strong propensity for sticking to the fragment ion. We have also considered mechanisms of intracluster reactions. In most cases, proton transfer between ammonia units take place. The theoretical calculations suggested the proton transfer either from the methyl group or from the hydroxyl group of the ionized methanol molecule to ammonia to be the energetically open channels. However, the experiments with selectively deuterated methanols did not show any evidence for the D+ transfer from the CD3 group. The proton transfer from the hydroxyl group could not be excluded entirely or confirmed unambiguously by the experiment.
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
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Physical Chemistry A
ISSN
1089-5639
e-ISSN
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Volume of the periodical
122
Issue of the periodical within the volume
43
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
8458-8468
UT code for WoS article
000449308300004
EID of the result in the Scopus database
2-s2.0-85055819539